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Finding the Fourth Proportional to 1,162.64, 1,605.49 and 867.40

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Solution

The fourth proportional to 1,162.64, 1,605.49 and 867.40 is: 1,197.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,162.64 : 1,605.49 = 867.40 : x
  2. Step 2: Convert to fraction form
    1,162.64/1,605.49 = 867.40/x
  3. Step 3: Cross multiply
    1,162.64x = 1,605.49 × 867.40
  4. Step 4: Simplify right side
    1,162.64x = 1,392,589.66
  5. Step 5: Solve for x
    x = 1,392,589.66/1,162.64
  6. Step 6: Final answer
    x = 1,197.78

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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.