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Finding the Fourth Proportional to 836.65, 1,153.28 and 689.03

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Solution

The fourth proportional to 836.65, 1,153.28 and 689.03 is: 949.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.65 : 1,153.28 = 689.03 : x
  2. Step 2: Convert to fraction form
    836.65/1,153.28 = 689.03/x
  3. Step 3: Cross multiply
    836.65x = 1,153.28 × 689.03
  4. Step 4: Simplify right side
    836.65x = 794,640.47
  5. Step 5: Solve for x
    x = 794,640.47/836.65
  6. Step 6: Final answer
    x = 949.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.