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Finding the Fourth Proportional to 658.98, 987.70 and 247.85

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Solution

The fourth proportional to 658.98, 987.70 and 247.85 is: 371.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.98 : 987.70 = 247.85 : x
  2. Step 2: Convert to fraction form
    658.98/987.70 = 247.85/x
  3. Step 3: Cross multiply
    658.98x = 987.70 × 247.85
  4. Step 4: Simplify right side
    658.98x = 244,801.45
  5. Step 5: Solve for x
    x = 244,801.45/658.98
  6. Step 6: Final answer
    x = 371.49

Related Problems

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Half scale
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Double scale
Find fourth proportional to 659.98, 989.20 and 248.85
Similar ratio
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1.5x scale

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.