Home / 129,141.11-178,214.57-71,778.62

Finding the Fourth Proportional to 129,141.11, 178,214.57 and 71,778.62

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Solution

The fourth proportional to 129,141.11, 178,214.57 and 71,778.62 is: 99,054.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,141.11 : 178,214.57 = 71,778.62 : x
  2. Step 2: Convert to fraction form
    129,141.11/178,214.57 = 71,778.62/x
  3. Step 3: Cross multiply
    129,141.11x = 178,214.57 × 71,778.62
  4. Step 4: Simplify right side
    129,141.11x = 12,791,996,306.07
  5. Step 5: Solve for x
    x = 12,791,996,306.07/129,141.11
  6. Step 6: Final answer
    x = 99,054.41

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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.