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Finding the Fourth Proportional to 614.75, 921.48 and 458.15

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Solution

The fourth proportional to 614.75, 921.48 and 458.15 is: 686.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.75 : 921.48 = 458.15 : x
  2. Step 2: Convert to fraction form
    614.75/921.48 = 458.15/x
  3. Step 3: Cross multiply
    614.75x = 921.48 × 458.15
  4. Step 4: Simplify right side
    614.75x = 422,169.74
  5. Step 5: Solve for x
    x = 422,169.74/614.75
  6. Step 6: Final answer
    x = 686.74

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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.