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Finding the Fourth Proportional to 2,481.60, 3,720 and 921.16

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Solution

The fourth proportional to 2,481.60, 3,720 and 921.16 is: 1,380.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,481.60 : 3,720 = 921.16 : x
  2. Step 2: Convert to fraction form
    2,481.60/3,720 = 921.16/x
  3. Step 3: Cross multiply
    2,481.60x = 3,720 × 921.16
  4. Step 4: Simplify right side
    2,481.60x = 3,426,715.20
  5. Step 5: Solve for x
    x = 3,426,715.20/2,481.60
  6. Step 6: Final answer
    x = 1,380.85

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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.