Home / 129,287.52-178,467.60-81,531.36

Finding the Fourth Proportional to 129,287.52, 178,467.60 and 81,531.36

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Solution

The fourth proportional to 129,287.52, 178,467.60 and 81,531.36 is: 112,545.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,287.52 : 178,467.60 = 81,531.36 : x
  2. Step 2: Convert to fraction form
    129,287.52/178,467.60 = 81,531.36/x
  3. Step 3: Cross multiply
    129,287.52x = 178,467.60 × 81,531.36
  4. Step 4: Simplify right side
    129,287.52x = 14,550,706,143.94
  5. Step 5: Solve for x
    x = 14,550,706,143.94/129,287.52
  6. Step 6: Final answer
    x = 112,545.33

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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.