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Finding the Fourth Proportional to 658.68, 909.30 and 422.88

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Solution

The fourth proportional to 658.68, 909.30 and 422.88 is: 583.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.68 : 909.30 = 422.88 : x
  2. Step 2: Convert to fraction form
    658.68/909.30 = 422.88/x
  3. Step 3: Cross multiply
    658.68x = 909.30 × 422.88
  4. Step 4: Simplify right side
    658.68x = 384,524.78
  5. Step 5: Solve for x
    x = 384,524.78/658.68
  6. Step 6: Final answer
    x = 583.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.