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Finding the Fourth Proportional to 949.89, 1,423.86 and 689.24

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Solution

The fourth proportional to 949.89, 1,423.86 and 689.24 is: 1,033.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.89 : 1,423.86 = 689.24 : x
  2. Step 2: Convert to fraction form
    949.89/1,423.86 = 689.24/x
  3. Step 3: Cross multiply
    949.89x = 1,423.86 × 689.24
  4. Step 4: Simplify right side
    949.89x = 981,381.27
  5. Step 5: Solve for x
    x = 981,381.27/949.89
  6. Step 6: Final answer
    x = 1,033.15

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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.