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Finding the Fourth Proportional to 658.14, 986.96 and 311.40

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Solution

The fourth proportional to 658.14, 986.96 and 311.40 is: 466.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.14 : 986.96 = 311.40 : x
  2. Step 2: Convert to fraction form
    658.14/986.96 = 311.40/x
  3. Step 3: Cross multiply
    658.14x = 986.96 × 311.40
  4. Step 4: Simplify right side
    658.14x = 307,339.34
  5. Step 5: Solve for x
    x = 307,339.34/658.14
  6. Step 6: Final answer
    x = 466.98

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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.