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Finding the Fourth Proportional to 458.30, 686.01 and 249.78

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Solution

The fourth proportional to 458.30, 686.01 and 249.78 is: 373.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.30 : 686.01 = 249.78 : x
  2. Step 2: Convert to fraction form
    458.30/686.01 = 249.78/x
  3. Step 3: Cross multiply
    458.30x = 686.01 × 249.78
  4. Step 4: Simplify right side
    458.30x = 171,351.23
  5. Step 5: Solve for x
    x = 171,351.23/458.30
  6. Step 6: Final answer
    x = 373.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.