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Finding the Fourth Proportional to 658.95, 987.08 and 369.78

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Solution

The fourth proportional to 658.95, 987.08 and 369.78 is: 553.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.95 : 987.08 = 369.78 : x
  2. Step 2: Convert to fraction form
    658.95/987.08 = 369.78/x
  3. Step 3: Cross multiply
    658.95x = 987.08 × 369.78
  4. Step 4: Simplify right side
    658.95x = 365,000.59
  5. Step 5: Solve for x
    x = 365,000.59/658.95
  6. Step 6: Final answer
    x = 553.91

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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.