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Finding the Fourth Proportional to 128,753.61, 177,678.12 and 71,393.04

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Solution

The fourth proportional to 128,753.61, 177,678.12 and 71,393.04 is: 98,521.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,753.61 : 177,678.12 = 71,393.04 : x
  2. Step 2: Convert to fraction form
    128,753.61/177,678.12 = 71,393.04/x
  3. Step 3: Cross multiply
    128,753.61x = 177,678.12 × 71,393.04
  4. Step 4: Simplify right side
    128,753.61x = 12,684,981,128.28
  5. Step 5: Solve for x
    x = 12,684,981,128.28/128,753.61
  6. Step 6: Final answer
    x = 98,521.36

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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.