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Finding the Fourth Proportional to 1,561.80, 2,155.28 and 863.18

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Solution

The fourth proportional to 1,561.80, 2,155.28 and 863.18 is: 1,191.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.80 : 2,155.28 = 863.18 : x
  2. Step 2: Convert to fraction form
    1,561.80/2,155.28 = 863.18/x
  3. Step 3: Cross multiply
    1,561.80x = 2,155.28 × 863.18
  4. Step 4: Simplify right side
    1,561.80x = 1,860,394.59
  5. Step 5: Solve for x
    x = 1,860,394.59/1,561.80
  6. Step 6: Final answer
    x = 1,191.19

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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.