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Finding the Fourth Proportional to 542.34, 748.28 and 321.22

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Solution

The fourth proportional to 542.34, 748.28 and 321.22 is: 443.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.34 : 748.28 = 321.22 : x
  2. Step 2: Convert to fraction form
    542.34/748.28 = 321.22/x
  3. Step 3: Cross multiply
    542.34x = 748.28 × 321.22
  4. Step 4: Simplify right side
    542.34x = 240,362.50
  5. Step 5: Solve for x
    x = 240,362.50/542.34
  6. Step 6: Final answer
    x = 443.20

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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.