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Finding the Fourth Proportional to 458.40, 686.98 and 252.66

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Solution

The fourth proportional to 458.40, 686.98 and 252.66 is: 378.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.40 : 686.98 = 252.66 : x
  2. Step 2: Convert to fraction form
    458.40/686.98 = 252.66/x
  3. Step 3: Cross multiply
    458.40x = 686.98 × 252.66
  4. Step 4: Simplify right side
    458.40x = 173,572.37
  5. Step 5: Solve for x
    x = 173,572.37/458.40
  6. Step 6: Final answer
    x = 378.65

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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.