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Finding the Fourth Proportional to 749.66, 1,121.75 and 441.65

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Solution

The fourth proportional to 749.66, 1,121.75 and 441.65 is: 660.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    749.66 : 1,121.75 = 441.65 : x
  2. Step 2: Convert to fraction form
    749.66/1,121.75 = 441.65/x
  3. Step 3: Cross multiply
    749.66x = 1,121.75 × 441.65
  4. Step 4: Simplify right side
    749.66x = 495,423.14
  5. Step 5: Solve for x
    x = 495,423.14/749.66
  6. Step 6: Final answer
    x = 660.87

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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.