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Finding the Fourth Proportional to 1,115.22, 1,671.28 and 922.54

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Solution

The fourth proportional to 1,115.22, 1,671.28 and 922.54 is: 1,382.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.22 : 1,671.28 = 922.54 : x
  2. Step 2: Convert to fraction form
    1,115.22/1,671.28 = 922.54/x
  3. Step 3: Cross multiply
    1,115.22x = 1,671.28 × 922.54
  4. Step 4: Simplify right side
    1,115.22x = 1,541,822.65
  5. Step 5: Solve for x
    x = 1,541,822.65/1,115.22
  6. Step 6: Final answer
    x = 1,382.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.