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Finding the Fourth Proportional to 1,128.81, 1,691.60 and 743.25

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Solution

The fourth proportional to 1,128.81, 1,691.60 and 743.25 is: 1,113.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.81 : 1,691.60 = 743.25 : x
  2. Step 2: Convert to fraction form
    1,128.81/1,691.60 = 743.25/x
  3. Step 3: Cross multiply
    1,128.81x = 1,691.60 × 743.25
  4. Step 4: Simplify right side
    1,128.81x = 1,257,277.98
  5. Step 5: Solve for x
    x = 1,257,277.98/1,128.81
  6. Step 6: Final answer
    x = 1,113.81

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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.