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Finding the Fourth Proportional to 1,321.57, 1,982.39 and 397.15

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Solution

The fourth proportional to 1,321.57, 1,982.39 and 397.15 is: 595.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.57 : 1,982.39 = 397.15 : x
  2. Step 2: Convert to fraction form
    1,321.57/1,982.39 = 397.15/x
  3. Step 3: Cross multiply
    1,321.57x = 1,982.39 × 397.15
  4. Step 4: Simplify right side
    1,321.57x = 787,294.29
  5. Step 5: Solve for x
    x = 787,294.29/1,321.57
  6. Step 6: Final answer
    x = 595.73

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1.5x scale

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.