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Finding the Fourth Proportional to 1,110.87, 1,531.71 and 961.20

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Solution

The fourth proportional to 1,110.87, 1,531.71 and 961.20 is: 1,325.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,110.87 : 1,531.71 = 961.20 : x
  2. Step 2: Convert to fraction form
    1,110.87/1,531.71 = 961.20/x
  3. Step 3: Cross multiply
    1,110.87x = 1,531.71 × 961.20
  4. Step 4: Simplify right side
    1,110.87x = 1,472,279.65
  5. Step 5: Solve for x
    x = 1,472,279.65/1,110.87
  6. Step 6: Final answer
    x = 1,325.34

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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.