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Finding the Fourth Proportional to 542.10, 747.90 and 345.57

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Solution

The fourth proportional to 542.10, 747.90 and 345.57 is: 476.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.10 : 747.90 = 345.57 : x
  2. Step 2: Convert to fraction form
    542.10/747.90 = 345.57/x
  3. Step 3: Cross multiply
    542.10x = 747.90 × 345.57
  4. Step 4: Simplify right side
    542.10x = 258,451.80
  5. Step 5: Solve for x
    x = 258,451.80/542.10
  6. Step 6: Final answer
    x = 476.76

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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.