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Finding the Fourth Proportional to 543.31, 814.61 and 478.44

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Solution

The fourth proportional to 543.31, 814.61 and 478.44 is: 717.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.31 : 814.61 = 478.44 : x
  2. Step 2: Convert to fraction form
    543.31/814.61 = 478.44/x
  3. Step 3: Cross multiply
    543.31x = 814.61 × 478.44
  4. Step 4: Simplify right side
    543.31x = 389,743.20
  5. Step 5: Solve for x
    x = 389,743.20/543.31
  6. Step 6: Final answer
    x = 717.35

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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.