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Finding the Fourth Proportional to 542.61, 748.70 and 321.63

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Solution

The fourth proportional to 542.61, 748.70 and 321.63 is: 443.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.61 : 748.70 = 321.63 : x
  2. Step 2: Convert to fraction form
    542.61/748.70 = 321.63/x
  3. Step 3: Cross multiply
    542.61x = 748.70 × 321.63
  4. Step 4: Simplify right side
    542.61x = 240,799.03
  5. Step 5: Solve for x
    x = 240,799.03/542.61
  6. Step 6: Final answer
    x = 443.78

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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.