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Finding the Fourth Proportional to 658.91, 988.71 and 385.53

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Solution

The fourth proportional to 658.91, 988.71 and 385.53 is: 578.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.91 : 988.71 = 385.53 : x
  2. Step 2: Convert to fraction form
    658.91/988.71 = 385.53/x
  3. Step 3: Cross multiply
    658.91x = 988.71 × 385.53
  4. Step 4: Simplify right side
    658.91x = 381,180.56
  5. Step 5: Solve for x
    x = 381,180.56/658.91
  6. Step 6: Final answer
    x = 578.50

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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.