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Finding the Fourth Proportional to 864.28, 1,290.11 and 749.53

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Solution

The fourth proportional to 864.28, 1,290.11 and 749.53 is: 1,118.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.28 : 1,290.11 = 749.53 : x
  2. Step 2: Convert to fraction form
    864.28/1,290.11 = 749.53/x
  3. Step 3: Cross multiply
    864.28x = 1,290.11 × 749.53
  4. Step 4: Simplify right side
    864.28x = 966,976.15
  5. Step 5: Solve for x
    x = 966,976.15/864.28
  6. Step 6: Final answer
    x = 1,118.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.