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Finding the Fourth Proportional to 1,439.20, 2,156.96 and 668

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Solution

The fourth proportional to 1,439.20, 2,156.96 and 668 is: 1,001.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.20 : 2,156.96 = 668 : x
  2. Step 2: Convert to fraction form
    1,439.20/2,156.96 = 668/x
  3. Step 3: Cross multiply
    1,439.20x = 2,156.96 × 668
  4. Step 4: Simplify right side
    1,439.20x = 1,440,849.28
  5. Step 5: Solve for x
    x = 1,440,849.28/1,439.20
  6. Step 6: Final answer
    x = 1,001.15

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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.