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Finding the Fourth Proportional to 458.56, 686.88 and 426.88

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Solution

The fourth proportional to 458.56, 686.88 and 426.88 is: 639.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.56 : 686.88 = 426.88 : x
  2. Step 2: Convert to fraction form
    458.56/686.88 = 426.88/x
  3. Step 3: Cross multiply
    458.56x = 686.88 × 426.88
  4. Step 4: Simplify right side
    458.56x = 293,215.33
  5. Step 5: Solve for x
    x = 293,215.33/458.56
  6. Step 6: Final answer
    x = 639.43

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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.