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Finding the Fourth Proportional to 671.40, 1,007.10 and 397.80

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Solution

The fourth proportional to 671.40, 1,007.10 and 397.80 is: 596.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.40 : 1,007.10 = 397.80 : x
  2. Step 2: Convert to fraction form
    671.40/1,007.10 = 397.80/x
  3. Step 3: Cross multiply
    671.40x = 1,007.10 × 397.80
  4. Step 4: Simplify right side
    671.40x = 400,624.38
  5. Step 5: Solve for x
    x = 400,624.38/671.40
  6. Step 6: Final answer
    x = 596.70

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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.