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Finding the Fourth Proportional to 981.30, 1,470.72 and 519.18

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Solution

The fourth proportional to 981.30, 1,470.72 and 519.18 is: 778.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.30 : 1,470.72 = 519.18 : x
  2. Step 2: Convert to fraction form
    981.30/1,470.72 = 519.18/x
  3. Step 3: Cross multiply
    981.30x = 1,470.72 × 519.18
  4. Step 4: Simplify right side
    981.30x = 763,568.41
  5. Step 5: Solve for x
    x = 763,568.41/981.30
  6. Step 6: Final answer
    x = 778.12

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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.