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Finding the Fourth Proportional to 542.15, 748.05 and 321.17

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Solution

The fourth proportional to 542.15, 748.05 and 321.17 is: 443.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.15 : 748.05 = 321.17 : x
  2. Step 2: Convert to fraction form
    542.15/748.05 = 321.17/x
  3. Step 3: Cross multiply
    542.15x = 748.05 × 321.17
  4. Step 4: Simplify right side
    542.15x = 240,251.22
  5. Step 5: Solve for x
    x = 240,251.22/542.15
  6. Step 6: Final answer
    x = 443.15

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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.