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Finding the Fourth Proportional to 1,081.11, 1,491.92 and 615.36

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Solution

The fourth proportional to 1,081.11, 1,491.92 and 615.36 is: 849.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.11 : 1,491.92 = 615.36 : x
  2. Step 2: Convert to fraction form
    1,081.11/1,491.92 = 615.36/x
  3. Step 3: Cross multiply
    1,081.11x = 1,491.92 × 615.36
  4. Step 4: Simplify right side
    1,081.11x = 918,067.89
  5. Step 5: Solve for x
    x = 918,067.89/1,081.11
  6. Step 6: Final answer
    x = 849.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.