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Finding the Fourth Proportional to 981.56, 1,472.22 and 251.15

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Solution

The fourth proportional to 981.56, 1,472.22 and 251.15 is: 376.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.56 : 1,472.22 = 251.15 : x
  2. Step 2: Convert to fraction form
    981.56/1,472.22 = 251.15/x
  3. Step 3: Cross multiply
    981.56x = 1,472.22 × 251.15
  4. Step 4: Simplify right side
    981.56x = 369,740.69
  5. Step 5: Solve for x
    x = 369,740.69/981.56
  6. Step 6: Final answer
    x = 376.69

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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.