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Finding the Fourth Proportional to 128,565.90, 177,431.92 and 74,867.76

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Solution

The fourth proportional to 128,565.90, 177,431.92 and 74,867.76 is: 103,323.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,565.90 : 177,431.92 = 74,867.76 : x
  2. Step 2: Convert to fraction form
    128,565.90/177,431.92 = 74,867.76/x
  3. Step 3: Cross multiply
    128,565.90x = 177,431.92 × 74,867.76
  4. Step 4: Simplify right side
    128,565.90x = 13,283,930,215.73
  5. Step 5: Solve for x
    x = 13,283,930,215.73/128,565.90
  6. Step 6: Final answer
    x = 103,323.90

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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.