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Finding the Fourth Proportional to 542.75, 748.90 and 321.65

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Solution

The fourth proportional to 542.75, 748.90 and 321.65 is: 443.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.75 : 748.90 = 321.65 : x
  2. Step 2: Convert to fraction form
    542.75/748.90 = 321.65/x
  3. Step 3: Cross multiply
    542.75x = 748.90 × 321.65
  4. Step 4: Simplify right side
    542.75x = 240,883.69
  5. Step 5: Solve for x
    x = 240,883.69/542.75
  6. Step 6: Final answer
    x = 443.82

Related Problems

Find fourth proportional to 271.38, 374.45 and 160.83
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Double scale
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Similar ratio
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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.