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Finding the Fourth Proportional to 1,439.89, 2,160.24 and 515.55

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Solution

The fourth proportional to 1,439.89, 2,160.24 and 515.55 is: 773.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.89 : 2,160.24 = 515.55 : x
  2. Step 2: Convert to fraction form
    1,439.89/2,160.24 = 515.55/x
  3. Step 3: Cross multiply
    1,439.89x = 2,160.24 × 515.55
  4. Step 4: Simplify right side
    1,439.89x = 1,113,711.73
  5. Step 5: Solve for x
    x = 1,113,711.73/1,439.89
  6. Step 6: Final answer
    x = 773.47

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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.