Home / 129,531.30-178,749.90-72,170.88

Finding the Fourth Proportional to 129,531.30, 178,749.90 and 72,170.88

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Solution

The fourth proportional to 129,531.30, 178,749.90 and 72,170.88 is: 99,593.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,531.30 : 178,749.90 = 72,170.88 : x
  2. Step 2: Convert to fraction form
    129,531.30/178,749.90 = 72,170.88/x
  3. Step 3: Cross multiply
    129,531.30x = 178,749.90 × 72,170.88
  4. Step 4: Simplify right side
    129,531.30x = 12,900,537,582.91
  5. Step 5: Solve for x
    x = 12,900,537,582.91/129,531.30
  6. Step 6: Final answer
    x = 99,593.98

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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.