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Finding the Fourth Proportional to 128,508.73, 177,342.42 and 71,920.11

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Solution

The fourth proportional to 128,508.73, 177,342.42 and 71,920.11 is: 99,249.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,508.73 : 177,342.42 = 71,920.11 : x
  2. Step 2: Convert to fraction form
    128,508.73/177,342.42 = 71,920.11/x
  3. Step 3: Cross multiply
    128,508.73x = 177,342.42 × 71,920.11
  4. Step 4: Simplify right side
    128,508.73x = 12,754,486,354.07
  5. Step 5: Solve for x
    x = 12,754,486,354.07/128,508.73
  6. Step 6: Final answer
    x = 99,249.96

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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.