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Finding the Fourth Proportional to 660.85, 992 and 331.70

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Solution

The fourth proportional to 660.85, 992 and 331.70 is: 497.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.85 : 992 = 331.70 : x
  2. Step 2: Convert to fraction form
    660.85/992 = 331.70/x
  3. Step 3: Cross multiply
    660.85x = 992 × 331.70
  4. Step 4: Simplify right side
    660.85x = 329,046.40
  5. Step 5: Solve for x
    x = 329,046.40/660.85
  6. Step 6: Final answer
    x = 497.91

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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.