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Finding the Fourth Proportional to 129,007.92, 178,030.80 and 72,419.40

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Solution

The fourth proportional to 129,007.92, 178,030.80 and 72,419.40 is: 99,938.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,007.92 : 178,030.80 = 72,419.40 : x
  2. Step 2: Convert to fraction form
    129,007.92/178,030.80 = 72,419.40/x
  3. Step 3: Cross multiply
    129,007.92x = 178,030.80 × 72,419.40
  4. Step 4: Simplify right side
    129,007.92x = 12,892,883,717.52
  5. Step 5: Solve for x
    x = 12,892,883,717.52/129,007.92
  6. Step 6: Final answer
    x = 99,938.70

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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.