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Finding the Fourth Proportional to 979.98, 1,470.24 and 331.17

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Solution

The fourth proportional to 979.98, 1,470.24 and 331.17 is: 496.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    979.98 : 1,470.24 = 331.17 : x
  2. Step 2: Convert to fraction form
    979.98/1,470.24 = 331.17/x
  3. Step 3: Cross multiply
    979.98x = 1,470.24 × 331.17
  4. Step 4: Simplify right side
    979.98x = 486,899.38
  5. Step 5: Solve for x
    x = 486,899.38/979.98
  6. Step 6: Final answer
    x = 496.85

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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.