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Finding the Fourth Proportional to 1,581, 2,181.80 and 872.86

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Solution

The fourth proportional to 1,581, 2,181.80 and 872.86 is: 1,204.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,581 : 2,181.80 = 872.86 : x
  2. Step 2: Convert to fraction form
    1,581/2,181.80 = 872.86/x
  3. Step 3: Cross multiply
    1,581x = 2,181.80 × 872.86
  4. Step 4: Simplify right side
    1,581x = 1,904,405.95
  5. Step 5: Solve for x
    x = 1,904,405.95/1,581
  6. Step 6: Final answer
    x = 1,204.56

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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.