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Finding the Fourth Proportional to 128,387, 177,174.66 and 71,798.38

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Solution

The fourth proportional to 128,387, 177,174.66 and 71,798.38 is: 99,082.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,387 : 177,174.66 = 71,798.38 : x
  2. Step 2: Convert to fraction form
    128,387/177,174.66 = 71,798.38/x
  3. Step 3: Cross multiply
    128,387x = 177,174.66 × 71,798.38
  4. Step 4: Simplify right side
    128,387x = 12,720,853,565.05
  5. Step 5: Solve for x
    x = 12,720,853,565.05/128,387
  6. Step 6: Final answer
    x = 99,082.10

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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.