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Finding the Fourth Proportional to 1,142.32, 1,713.42 and 449.11

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Solution

The fourth proportional to 1,142.32, 1,713.42 and 449.11 is: 673.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.32 : 1,713.42 = 449.11 : x
  2. Step 2: Convert to fraction form
    1,142.32/1,713.42 = 449.11/x
  3. Step 3: Cross multiply
    1,142.32x = 1,713.42 × 449.11
  4. Step 4: Simplify right side
    1,142.32x = 769,514.06
  5. Step 5: Solve for x
    x = 769,514.06/1,142.32
  6. Step 6: Final answer
    x = 673.64

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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.