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Finding the Fourth Proportional to 981.20, 1,472.61 and 879.14

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Solution

The fourth proportional to 981.20, 1,472.61 and 879.14 is: 1,319.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.20 : 1,472.61 = 879.14 : x
  2. Step 2: Convert to fraction form
    981.20/1,472.61 = 879.14/x
  3. Step 3: Cross multiply
    981.20x = 1,472.61 × 879.14
  4. Step 4: Simplify right side
    981.20x = 1,294,630.36
  5. Step 5: Solve for x
    x = 1,294,630.36/981.20
  6. Step 6: Final answer
    x = 1,319.44

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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.