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Finding the Fourth Proportional to 981.32, 1,470.90 and 331.72

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Solution

The fourth proportional to 981.32, 1,470.90 and 331.72 is: 497.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.32 : 1,470.90 = 331.72 : x
  2. Step 2: Convert to fraction form
    981.32/1,470.90 = 331.72/x
  3. Step 3: Cross multiply
    981.32x = 1,470.90 × 331.72
  4. Step 4: Simplify right side
    981.32x = 487,926.95
  5. Step 5: Solve for x
    x = 487,926.95/981.32
  6. Step 6: Final answer
    x = 497.21

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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.