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Finding the Fourth Proportional to 458.19, 686.94 and 149.85

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Solution

The fourth proportional to 458.19, 686.94 and 149.85 is: 224.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.19 : 686.94 = 149.85 : x
  2. Step 2: Convert to fraction form
    458.19/686.94 = 149.85/x
  3. Step 3: Cross multiply
    458.19x = 686.94 × 149.85
  4. Step 4: Simplify right side
    458.19x = 102,937.96
  5. Step 5: Solve for x
    x = 102,937.96/458.19
  6. Step 6: Final answer
    x = 224.66

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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.