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Finding the Fourth Proportional to 1,579.99, 2,180.38 and 871.80

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Solution

The fourth proportional to 1,579.99, 2,180.38 and 871.80 is: 1,203.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,579.99 : 2,180.38 = 871.80 : x
  2. Step 2: Convert to fraction form
    1,579.99/2,180.38 = 871.80/x
  3. Step 3: Cross multiply
    1,579.99x = 2,180.38 × 871.80
  4. Step 4: Simplify right side
    1,579.99x = 1,900,855.28
  5. Step 5: Solve for x
    x = 1,900,855.28/1,579.99
  6. Step 6: Final answer
    x = 1,203.08

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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.