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Finding the Fourth Proportional to 1,372.80, 2,059.56 and 398.88

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Solution

The fourth proportional to 1,372.80, 2,059.56 and 398.88 is: 598.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.80 : 2,059.56 = 398.88 : x
  2. Step 2: Convert to fraction form
    1,372.80/2,059.56 = 398.88/x
  3. Step 3: Cross multiply
    1,372.80x = 2,059.56 × 398.88
  4. Step 4: Simplify right side
    1,372.80x = 821,517.29
  5. Step 5: Solve for x
    x = 821,517.29/1,372.80
  6. Step 6: Final answer
    x = 598.42

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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.