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Finding the Fourth Proportional to 862.31, 1,291.44 and 749.69

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Solution

The fourth proportional to 862.31, 1,291.44 and 749.69 is: 1,122.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.31 : 1,291.44 = 749.69 : x
  2. Step 2: Convert to fraction form
    862.31/1,291.44 = 749.69/x
  3. Step 3: Cross multiply
    862.31x = 1,291.44 × 749.69
  4. Step 4: Simplify right side
    862.31x = 968,180.85
  5. Step 5: Solve for x
    x = 968,180.85/862.31
  6. Step 6: Final answer
    x = 1,122.77

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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.