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Finding the Fourth Proportional to 128,380.80, 177,165.84 and 71,792.17

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Solution

The fourth proportional to 128,380.80, 177,165.84 and 71,792.17 is: 99,073.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,380.80 : 177,165.84 = 71,792.17 : x
  2. Step 2: Convert to fraction form
    128,380.80/177,165.84 = 71,792.17/x
  3. Step 3: Cross multiply
    128,380.80x = 177,165.84 × 71,792.17
  4. Step 4: Simplify right side
    128,380.80x = 12,719,120,103.47
  5. Step 5: Solve for x
    x = 12,719,120,103.47/128,380.80
  6. Step 6: Final answer
    x = 99,073.38

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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.