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Finding the Fourth Proportional to 129,355.40, 178,510.20 and 72,766.78

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Solution

The fourth proportional to 129,355.40, 178,510.20 and 72,766.78 is: 100,418.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,355.40 : 178,510.20 = 72,766.78 : x
  2. Step 2: Convert to fraction form
    129,355.40/178,510.20 = 72,766.78/x
  3. Step 3: Cross multiply
    129,355.40x = 178,510.20 × 72,766.78
  4. Step 4: Simplify right side
    129,355.40x = 12,989,612,451.16
  5. Step 5: Solve for x
    x = 12,989,612,451.16/129,355.40
  6. Step 6: Final answer
    x = 100,418.01

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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.