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Finding the Fourth Proportional to 1,561.97, 2,155.66 and 863.48

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Solution

The fourth proportional to 1,561.97, 2,155.66 and 863.48 is: 1,191.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.97 : 2,155.66 = 863.48 : x
  2. Step 2: Convert to fraction form
    1,561.97/2,155.66 = 863.48/x
  3. Step 3: Cross multiply
    1,561.97x = 2,155.66 × 863.48
  4. Step 4: Simplify right side
    1,561.97x = 1,861,369.30
  5. Step 5: Solve for x
    x = 1,861,369.30/1,561.97
  6. Step 6: Final answer
    x = 1,191.68

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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.