Home / 81,193,150.80-121,789,726.20-78,801,666.30

Finding the Fourth Proportional to 81,193,150.80, 121,789,726.20 and 78,801,666.30

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Solution

The fourth proportional to 81,193,150.80, 121,789,726.20 and 78,801,666.30 is: 118,202,499.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,193,150.80 : 121,789,726.20 = 78,801,666.30 : x
  2. Step 2: Convert to fraction form
    81,193,150.80/121,789,726.20 = 78,801,666.30/x
  3. Step 3: Cross multiply
    81,193,150.80x = 121,789,726.20 × 78,801,666.30
  4. Step 4: Simplify right side
    81,193,150.80x = 9,597,233,362,780,766
  5. Step 5: Solve for x
    x = 9,597,233,362,780,766/81,193,150.80
  6. Step 6: Final answer
    x = 118,202,499.45

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.