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Finding the Fourth Proportional to 542.60, 748.43 and 321.39

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Solution

The fourth proportional to 542.60, 748.43 and 321.39 is: 443.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.60 : 748.43 = 321.39 : x
  2. Step 2: Convert to fraction form
    542.60/748.43 = 321.39/x
  3. Step 3: Cross multiply
    542.60x = 748.43 × 321.39
  4. Step 4: Simplify right side
    542.60x = 240,534.98
  5. Step 5: Solve for x
    x = 240,534.98/542.60
  6. Step 6: Final answer
    x = 443.30

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1.5x scale

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.