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Finding the Fourth Proportional to 3,171.32, 4,755 and 1,221.20

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Solution

The fourth proportional to 3,171.32, 4,755 and 1,221.20 is: 1,831.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,171.32 : 4,755 = 1,221.20 : x
  2. Step 2: Convert to fraction form
    3,171.32/4,755 = 1,221.20/x
  3. Step 3: Cross multiply
    3,171.32x = 4,755 × 1,221.20
  4. Step 4: Simplify right side
    3,171.32x = 5,806,806
  5. Step 5: Solve for x
    x = 5,806,806/3,171.32
  6. Step 6: Final answer
    x = 1,831.04

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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.