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Finding the Fourth Proportional to 763.38, 1,144.74 and 411.66

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Solution

The fourth proportional to 763.38, 1,144.74 and 411.66 is: 617.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.38 : 1,144.74 = 411.66 : x
  2. Step 2: Convert to fraction form
    763.38/1,144.74 = 411.66/x
  3. Step 3: Cross multiply
    763.38x = 1,144.74 × 411.66
  4. Step 4: Simplify right side
    763.38x = 471,243.67
  5. Step 5: Solve for x
    x = 471,243.67/763.38
  6. Step 6: Final answer
    x = 617.31

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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.