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Finding the Fourth Proportional to 128,508.68, 177,345.96 and 71,919.92

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Solution

The fourth proportional to 128,508.68, 177,345.96 and 71,919.92 is: 99,251.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,508.68 : 177,345.96 = 71,919.92 : x
  2. Step 2: Convert to fraction form
    128,508.68/177,345.96 = 71,919.92/x
  3. Step 3: Cross multiply
    128,508.68x = 177,345.96 × 71,919.92
  4. Step 4: Simplify right side
    128,508.68x = 12,754,707,255.52
  5. Step 5: Solve for x
    x = 12,754,707,255.52/128,508.68
  6. Step 6: Final answer
    x = 99,251.72

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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.