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Finding the Fourth Proportional to 542.97, 749.40 and 321.90

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Solution

The fourth proportional to 542.97, 749.40 and 321.90 is: 444.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.97 : 749.40 = 321.90 : x
  2. Step 2: Convert to fraction form
    542.97/749.40 = 321.90/x
  3. Step 3: Cross multiply
    542.97x = 749.40 × 321.90
  4. Step 4: Simplify right side
    542.97x = 241,231.86
  5. Step 5: Solve for x
    x = 241,231.86/542.97
  6. Step 6: Final answer
    x = 444.28

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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.