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Finding the Fourth Proportional to 542.90, 749.20 and 321.82

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Solution

The fourth proportional to 542.90, 749.20 and 321.82 is: 444.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.90 : 749.20 = 321.82 : x
  2. Step 2: Convert to fraction form
    542.90/749.20 = 321.82/x
  3. Step 3: Cross multiply
    542.90x = 749.20 × 321.82
  4. Step 4: Simplify right side
    542.90x = 241,109.68
  5. Step 5: Solve for x
    x = 241,109.68/542.90
  6. Step 6: Final answer
    x = 444.11

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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.