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Finding the Fourth Proportional to 671.55, 1,006.98 and 397.56

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Solution

The fourth proportional to 671.55, 1,006.98 and 397.56 is: 596.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.55 : 1,006.98 = 397.56 : x
  2. Step 2: Convert to fraction form
    671.55/1,006.98 = 397.56/x
  3. Step 3: Cross multiply
    671.55x = 1,006.98 × 397.56
  4. Step 4: Simplify right side
    671.55x = 400,334.97
  5. Step 5: Solve for x
    x = 400,334.97/671.55
  6. Step 6: Final answer
    x = 596.14

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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.