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Finding the Fourth Proportional to 129,354.76, 178,509.51 and 72,766.13

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Solution

The fourth proportional to 129,354.76, 178,509.51 and 72,766.13 is: 100,417.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,354.76 : 178,509.51 = 72,766.13 : x
  2. Step 2: Convert to fraction form
    129,354.76/178,509.51 = 72,766.13/x
  3. Step 3: Cross multiply
    129,354.76x = 178,509.51 × 72,766.13
  4. Step 4: Simplify right side
    129,354.76x = 12,989,446,210.90
  5. Step 5: Solve for x
    x = 12,989,446,210.90/129,354.76
  6. Step 6: Final answer
    x = 100,417.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.