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Finding the Fourth Proportional to 457.90, 686.86 and 149.75

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Solution

The fourth proportional to 457.90, 686.86 and 149.75 is: 224.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.90 : 686.86 = 149.75 : x
  2. Step 2: Convert to fraction form
    457.90/686.86 = 149.75/x
  3. Step 3: Cross multiply
    457.90x = 686.86 × 149.75
  4. Step 4: Simplify right side
    457.90x = 102,856.54
  5. Step 5: Solve for x
    x = 102,856.54/457.90
  6. Step 6: Final answer
    x = 224.63

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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.