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Finding the Fourth Proportional to 981.62, 1,472.40 and 461.49

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Solution

The fourth proportional to 981.62, 1,472.40 and 461.49 is: 692.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.62 : 1,472.40 = 461.49 : x
  2. Step 2: Convert to fraction form
    981.62/1,472.40 = 461.49/x
  3. Step 3: Cross multiply
    981.62x = 1,472.40 × 461.49
  4. Step 4: Simplify right side
    981.62x = 679,497.88
  5. Step 5: Solve for x
    x = 679,497.88/981.62
  6. Step 6: Final answer
    x = 692.22

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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.