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Finding the Fourth Proportional to 1,111.80, 1,532.70 and 862.68

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Solution

The fourth proportional to 1,111.80, 1,532.70 and 862.68 is: 1,189.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.80 : 1,532.70 = 862.68 : x
  2. Step 2: Convert to fraction form
    1,111.80/1,532.70 = 862.68/x
  3. Step 3: Cross multiply
    1,111.80x = 1,532.70 × 862.68
  4. Step 4: Simplify right side
    1,111.80x = 1,322,229.64
  5. Step 5: Solve for x
    x = 1,322,229.64/1,111.80
  6. Step 6: Final answer
    x = 1,189.27

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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.