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Finding the Fourth Proportional to 749.85, 1,121.77 and 648.23

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Solution

The fourth proportional to 749.85, 1,121.77 and 648.23 is: 969.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.85 : 1,121.77 = 648.23 : x
  2. Step 2: Convert to fraction form
    749.85/1,121.77 = 648.23/x
  3. Step 3: Cross multiply
    749.85x = 1,121.77 × 648.23
  4. Step 4: Simplify right side
    749.85x = 727,164.38
  5. Step 5: Solve for x
    x = 727,164.38/749.85
  6. Step 6: Final answer
    x = 969.75

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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.