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Finding the Fourth Proportional to 128,875.30, 177,843.25 and 71,517.12

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Solution

The fourth proportional to 128,875.30, 177,843.25 and 71,517.12 is: 98,691.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,875.30 : 177,843.25 = 71,517.12 : x
  2. Step 2: Convert to fraction form
    128,875.30/177,843.25 = 71,517.12/x
  3. Step 3: Cross multiply
    128,875.30x = 177,843.25 × 71,517.12
  4. Step 4: Simplify right side
    128,875.30x = 12,718,837,399.53
  5. Step 5: Solve for x
    x = 12,718,837,399.53/128,875.30
  6. Step 6: Final answer
    x = 98,691.04

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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.