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Finding the Fourth Proportional to 81,188.80, 121,783.20 and 51,737.20

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Solution

The fourth proportional to 81,188.80, 121,783.20 and 51,737.20 is: 77,605.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,188.80 : 121,783.20 = 51,737.20 : x
  2. Step 2: Convert to fraction form
    81,188.80/121,783.20 = 51,737.20/x
  3. Step 3: Cross multiply
    81,188.80x = 121,783.20 × 51,737.20
  4. Step 4: Simplify right side
    81,188.80x = 6,300,721,775.04
  5. Step 5: Solve for x
    x = 6,300,721,775.04/81,188.80
  6. Step 6: Final answer
    x = 77,605.80

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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.