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Finding the Fourth Proportional to 658.89, 986.88 and 380.61

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Solution

The fourth proportional to 658.89, 986.88 and 380.61 is: 570.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.89 : 986.88 = 380.61 : x
  2. Step 2: Convert to fraction form
    658.89/986.88 = 380.61/x
  3. Step 3: Cross multiply
    658.89x = 986.88 × 380.61
  4. Step 4: Simplify right side
    658.89x = 375,616.40
  5. Step 5: Solve for x
    x = 375,616.40/658.89
  6. Step 6: Final answer
    x = 570.07

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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.