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Finding the Fourth Proportional to 963.72, 1,446.12 and 387

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Solution

The fourth proportional to 963.72, 1,446.12 and 387 is: 580.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.72 : 1,446.12 = 387 : x
  2. Step 2: Convert to fraction form
    963.72/1,446.12 = 387/x
  3. Step 3: Cross multiply
    963.72x = 1,446.12 × 387
  4. Step 4: Simplify right side
    963.72x = 559,648.44
  5. Step 5: Solve for x
    x = 559,648.44/963.72
  6. Step 6: Final answer
    x = 580.72

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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.