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Finding the Fourth Proportional to 658.66, 909.21 and 396.63

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Solution

The fourth proportional to 658.66, 909.21 and 396.63 is: 547.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.66 : 909.21 = 396.63 : x
  2. Step 2: Convert to fraction form
    658.66/909.21 = 396.63/x
  3. Step 3: Cross multiply
    658.66x = 909.21 × 396.63
  4. Step 4: Simplify right side
    658.66x = 360,615.42
  5. Step 5: Solve for x
    x = 360,615.42/658.66
  6. Step 6: Final answer
    x = 547.50

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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.