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Finding the Fourth Proportional to 2,721.47, 4,080.21 and 871.53

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Solution

The fourth proportional to 2,721.47, 4,080.21 and 871.53 is: 1,306.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,721.47 : 4,080.21 = 871.53 : x
  2. Step 2: Convert to fraction form
    2,721.47/4,080.21 = 871.53/x
  3. Step 3: Cross multiply
    2,721.47x = 4,080.21 × 871.53
  4. Step 4: Simplify right side
    2,721.47x = 3,556,006.85
  5. Step 5: Solve for x
    x = 3,556,006.85/2,721.47
  6. Step 6: Final answer
    x = 1,306.65

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1.5x scale

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.