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Finding the Fourth Proportional to 1,581.12, 2,181.96 and 918

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Solution

The fourth proportional to 1,581.12, 2,181.96 and 918 is: 1,266.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581.12 : 2,181.96 = 918 : x
  2. Step 2: Convert to fraction form
    1,581.12/2,181.96 = 918/x
  3. Step 3: Cross multiply
    1,581.12x = 2,181.96 × 918
  4. Step 4: Simplify right side
    1,581.12x = 2,003,039.28
  5. Step 5: Solve for x
    x = 2,003,039.28/1,581.12
  6. Step 6: Final answer
    x = 1,266.85

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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.