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Finding the Fourth Proportional to 543.47, 815.21 and 132.61

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Solution

The fourth proportional to 543.47, 815.21 and 132.61 is: 198.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.47 : 815.21 = 132.61 : x
  2. Step 2: Convert to fraction form
    543.47/815.21 = 132.61/x
  3. Step 3: Cross multiply
    543.47x = 815.21 × 132.61
  4. Step 4: Simplify right side
    543.47x = 108,100.26
  5. Step 5: Solve for x
    x = 108,100.26/543.47
  6. Step 6: Final answer
    x = 198.91

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Similar ratio
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.