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Finding the Fourth Proportional to 981.78, 1,472.13 and 365.37

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Solution

The fourth proportional to 981.78, 1,472.13 and 365.37 is: 547.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.78 : 1,472.13 = 365.37 : x
  2. Step 2: Convert to fraction form
    981.78/1,472.13 = 365.37/x
  3. Step 3: Cross multiply
    981.78x = 1,472.13 × 365.37
  4. Step 4: Simplify right side
    981.78x = 537,872.14
  5. Step 5: Solve for x
    x = 537,872.14/981.78
  6. Step 6: Final answer
    x = 547.85

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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.