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Finding the Fourth Proportional to 981.55, 1,472.33 and 251.12

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Solution

The fourth proportional to 981.55, 1,472.33 and 251.12 is: 376.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.55 : 1,472.33 = 251.12 : x
  2. Step 2: Convert to fraction form
    981.55/1,472.33 = 251.12/x
  3. Step 3: Cross multiply
    981.55x = 1,472.33 × 251.12
  4. Step 4: Simplify right side
    981.55x = 369,731.51
  5. Step 5: Solve for x
    x = 369,731.51/981.55
  6. Step 6: Final answer
    x = 376.68

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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.