Home / 129,318.05-178,460.48-72,729.43

Finding the Fourth Proportional to 129,318.05, 178,460.48 and 72,729.43

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Solution

The fourth proportional to 129,318.05, 178,460.48 and 72,729.43 is: 100,367.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,318.05 : 178,460.48 = 72,729.43 : x
  2. Step 2: Convert to fraction form
    129,318.05/178,460.48 = 72,729.43/x
  3. Step 3: Cross multiply
    129,318.05x = 178,460.48 × 72,729.43
  4. Step 4: Simplify right side
    129,318.05x = 12,979,328,723.60
  5. Step 5: Solve for x
    x = 12,979,328,723.60/129,318.05
  6. Step 6: Final answer
    x = 100,367.49

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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.