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Finding the Fourth Proportional to 688.91, 1,034.13 and 381.36

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Solution

The fourth proportional to 688.91, 1,034.13 and 381.36 is: 572.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.91 : 1,034.13 = 381.36 : x
  2. Step 2: Convert to fraction form
    688.91/1,034.13 = 381.36/x
  3. Step 3: Cross multiply
    688.91x = 1,034.13 × 381.36
  4. Step 4: Simplify right side
    688.91x = 394,372.49
  5. Step 5: Solve for x
    x = 394,372.49/688.91
  6. Step 6: Final answer
    x = 572.46

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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.