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Finding the Fourth Proportional to 876.26, 1,207.98 and 689

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Solution

The fourth proportional to 876.26, 1,207.98 and 689 is: 949.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.26 : 1,207.98 = 689 : x
  2. Step 2: Convert to fraction form
    876.26/1,207.98 = 689/x
  3. Step 3: Cross multiply
    876.26x = 1,207.98 × 689
  4. Step 4: Simplify right side
    876.26x = 832,298.22
  5. Step 5: Solve for x
    x = 832,298.22/876.26
  6. Step 6: Final answer
    x = 949.83

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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.