Home / 121,286.20-181,929.30-76,999.45

Finding the Fourth Proportional to 121,286.20, 181,929.30 and 76,999.45

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Solution

The fourth proportional to 121,286.20, 181,929.30 and 76,999.45 is: 115,499.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,286.20 : 181,929.30 = 76,999.45 : x
  2. Step 2: Convert to fraction form
    121,286.20/181,929.30 = 76,999.45/x
  3. Step 3: Cross multiply
    121,286.20x = 181,929.30 × 76,999.45
  4. Step 4: Simplify right side
    121,286.20x = 14,008,456,038.89
  5. Step 5: Solve for x
    x = 14,008,456,038.89/121,286.20
  6. Step 6: Final answer
    x = 115,499.18

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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.