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Finding the Fourth Proportional to 129,057.84, 178,117.20 and 72,472.32

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Solution

The fourth proportional to 129,057.84, 178,117.20 and 72,472.32 is: 100,021.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,057.84 : 178,117.20 = 72,472.32 : x
  2. Step 2: Convert to fraction form
    129,057.84/178,117.20 = 72,472.32/x
  3. Step 3: Cross multiply
    129,057.84x = 178,117.20 × 72,472.32
  4. Step 4: Simplify right side
    129,057.84x = 12,908,566,715.90
  5. Step 5: Solve for x
    x = 12,908,566,715.90/129,057.84
  6. Step 6: Final answer
    x = 100,021.56

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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.