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Finding the Fourth Proportional to 1,321.86, 1,982.55 and 397.20

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Solution

The fourth proportional to 1,321.86, 1,982.55 and 397.20 is: 595.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.86 : 1,982.55 = 397.20 : x
  2. Step 2: Convert to fraction form
    1,321.86/1,982.55 = 397.20/x
  3. Step 3: Cross multiply
    1,321.86x = 1,982.55 × 397.20
  4. Step 4: Simplify right side
    1,321.86x = 787,468.86
  5. Step 5: Solve for x
    x = 787,468.86/1,321.86
  6. Step 6: Final answer
    x = 595.73

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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.