Home / 129,209.60-178,379.84-78,231.04

Finding the Fourth Proportional to 129,209.60, 178,379.84 and 78,231.04

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Solution

The fourth proportional to 129,209.60, 178,379.84 and 78,231.04 is: 108,001.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,209.60 : 178,379.84 = 78,231.04 : x
  2. Step 2: Convert to fraction form
    129,209.60/178,379.84 = 78,231.04/x
  3. Step 3: Cross multiply
    129,209.60x = 178,379.84 × 78,231.04
  4. Step 4: Simplify right side
    129,209.60x = 13,954,840,398.23
  5. Step 5: Solve for x
    x = 13,954,840,398.23/129,209.60
  6. Step 6: Final answer
    x = 108,001.58

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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.