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Finding the Fourth Proportional to 1,579.81, 2,180.12 and 871.66

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Solution

The fourth proportional to 1,579.81, 2,180.12 and 871.66 is: 1,202.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,579.81 : 2,180.12 = 871.66 : x
  2. Step 2: Convert to fraction form
    1,579.81/2,180.12 = 871.66/x
  3. Step 3: Cross multiply
    1,579.81x = 2,180.12 × 871.66
  4. Step 4: Simplify right side
    1,579.81x = 1,900,324.22
  5. Step 5: Solve for x
    x = 1,900,324.22/1,579.81
  6. Step 6: Final answer
    x = 1,202.88

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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.