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Finding the Fourth Proportional to 1,128.67, 1,557.46 and 863.29

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Solution

The fourth proportional to 1,128.67, 1,557.46 and 863.29 is: 1,191.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.67 : 1,557.46 = 863.29 : x
  2. Step 2: Convert to fraction form
    1,128.67/1,557.46 = 863.29/x
  3. Step 3: Cross multiply
    1,128.67x = 1,557.46 × 863.29
  4. Step 4: Simplify right side
    1,128.67x = 1,344,542.67
  5. Step 5: Solve for x
    x = 1,344,542.67/1,128.67
  6. Step 6: Final answer
    x = 1,191.27

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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.