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Finding the Fourth Proportional to 542.57, 748.63 and 321.55

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Solution

The fourth proportional to 542.57, 748.63 and 321.55 is: 443.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.57 : 748.63 = 321.55 : x
  2. Step 2: Convert to fraction form
    542.57/748.63 = 321.55/x
  3. Step 3: Cross multiply
    542.57x = 748.63 × 321.55
  4. Step 4: Simplify right side
    542.57x = 240,721.98
  5. Step 5: Solve for x
    x = 240,721.98/542.57
  6. Step 6: Final answer
    x = 443.67

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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.