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Finding the Fourth Proportional to 989.28, 1,366.81 and 695.86

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Solution

The fourth proportional to 989.28, 1,366.81 and 695.86 is: 961.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.28 : 1,366.81 = 695.86 : x
  2. Step 2: Convert to fraction form
    989.28/1,366.81 = 695.86/x
  3. Step 3: Cross multiply
    989.28x = 1,366.81 × 695.86
  4. Step 4: Simplify right side
    989.28x = 951,103.25
  5. Step 5: Solve for x
    x = 951,103.25/989.28
  6. Step 6: Final answer
    x = 961.41

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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.