Home / 129,705.14-178,965.87-78,744.70

Finding the Fourth Proportional to 129,705.14, 178,965.87 and 78,744.70

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Solution

The fourth proportional to 129,705.14, 178,965.87 and 78,744.70 is: 108,651.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,705.14 : 178,965.87 = 78,744.70 : x
  2. Step 2: Convert to fraction form
    129,705.14/178,965.87 = 78,744.70/x
  3. Step 3: Cross multiply
    129,705.14x = 178,965.87 × 78,744.70
  4. Step 4: Simplify right side
    129,705.14x = 14,092,613,743.39
  5. Step 5: Solve for x
    x = 14,092,613,743.39/129,705.14
  6. Step 6: Final answer
    x = 108,651.16

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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.