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Finding the Fourth Proportional to 1,436.78, 2,155.24 and 449.72

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Solution

The fourth proportional to 1,436.78, 2,155.24 and 449.72 is: 674.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,436.78 : 2,155.24 = 449.72 : x
  2. Step 2: Convert to fraction form
    1,436.78/2,155.24 = 449.72/x
  3. Step 3: Cross multiply
    1,436.78x = 2,155.24 × 449.72
  4. Step 4: Simplify right side
    1,436.78x = 969,252.28
  5. Step 5: Solve for x
    x = 969,252.28/1,436.78
  6. Step 6: Final answer
    x = 674.60

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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.