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Finding the Fourth Proportional to 981.45, 1,472.49 and 396.72

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Solution

The fourth proportional to 981.45, 1,472.49 and 396.72 is: 595.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.45 : 1,472.49 = 396.72 : x
  2. Step 2: Convert to fraction form
    981.45/1,472.49 = 396.72/x
  3. Step 3: Cross multiply
    981.45x = 1,472.49 × 396.72
  4. Step 4: Simplify right side
    981.45x = 584,166.23
  5. Step 5: Solve for x
    x = 584,166.23/981.45
  6. Step 6: Final answer
    x = 595.21

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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.