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Finding the Fourth Proportional to 1,561.11, 2,154.31 and 862.48

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Solution

The fourth proportional to 1,561.11, 2,154.31 and 862.48 is: 1,190.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.11 : 2,154.31 = 862.48 : x
  2. Step 2: Convert to fraction form
    1,561.11/2,154.31 = 862.48/x
  3. Step 3: Cross multiply
    1,561.11x = 2,154.31 × 862.48
  4. Step 4: Simplify right side
    1,561.11x = 1,858,049.29
  5. Step 5: Solve for x
    x = 1,858,049.29/1,561.11
  6. Step 6: Final answer
    x = 1,190.21

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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.