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Finding the Fourth Proportional to 542.70, 748.83 and 321.66

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Solution

The fourth proportional to 542.70, 748.83 and 321.66 is: 443.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.70 : 748.83 = 321.66 : x
  2. Step 2: Convert to fraction form
    542.70/748.83 = 321.66/x
  3. Step 3: Cross multiply
    542.70x = 748.83 × 321.66
  4. Step 4: Simplify right side
    542.70x = 240,868.66
  5. Step 5: Solve for x
    x = 240,868.66/542.70
  6. Step 6: Final answer
    x = 443.83

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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.