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Finding the Fourth Proportional to 658.86, 909.30 and 396.87

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Solution

The fourth proportional to 658.86, 909.30 and 396.87 is: 547.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.86 : 909.30 = 396.87 : x
  2. Step 2: Convert to fraction form
    658.86/909.30 = 396.87/x
  3. Step 3: Cross multiply
    658.86x = 909.30 × 396.87
  4. Step 4: Simplify right side
    658.86x = 360,873.89
  5. Step 5: Solve for x
    x = 360,873.89/658.86
  6. Step 6: Final answer
    x = 547.72

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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.