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Finding the Fourth Proportional to 864.04, 1,292.60 and 749.90

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Solution

The fourth proportional to 864.04, 1,292.60 and 749.90 is: 1,121.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.04 : 1,292.60 = 749.90 : x
  2. Step 2: Convert to fraction form
    864.04/1,292.60 = 749.90/x
  3. Step 3: Cross multiply
    864.04x = 1,292.60 × 749.90
  4. Step 4: Simplify right side
    864.04x = 969,320.74
  5. Step 5: Solve for x
    x = 969,320.74/864.04
  6. Step 6: Final answer
    x = 1,121.85

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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.