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Finding the Fourth Proportional to 866.28, 1,195.75 and 689.57

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Solution

The fourth proportional to 866.28, 1,195.75 and 689.57 is: 951.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    866.28 : 1,195.75 = 689.57 : x
  2. Step 2: Convert to fraction form
    866.28/1,195.75 = 689.57/x
  3. Step 3: Cross multiply
    866.28x = 1,195.75 × 689.57
  4. Step 4: Simplify right side
    866.28x = 824,548.21
  5. Step 5: Solve for x
    x = 824,548.21/866.28
  6. Step 6: Final answer
    x = 951.83

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1.5x scale

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.