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Finding the Fourth Proportional to 542.33, 748.43 and 321.40

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Solution

The fourth proportional to 542.33, 748.43 and 321.40 is: 443.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.33 : 748.43 = 321.40 : x
  2. Step 2: Convert to fraction form
    542.33/748.43 = 321.40/x
  3. Step 3: Cross multiply
    542.33x = 748.43 × 321.40
  4. Step 4: Simplify right side
    542.33x = 240,545.40
  5. Step 5: Solve for x
    x = 240,545.40/542.33
  6. Step 6: Final answer
    x = 443.54

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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.