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Finding the Fourth Proportional to 2,687.47, 4,031.23 and 838.51

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Solution

The fourth proportional to 2,687.47, 4,031.23 and 838.51 is: 1,257.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,687.47 : 4,031.23 = 838.51 : x
  2. Step 2: Convert to fraction form
    2,687.47/4,031.23 = 838.51/x
  3. Step 3: Cross multiply
    2,687.47x = 4,031.23 × 838.51
  4. Step 4: Simplify right side
    2,687.47x = 3,380,226.67
  5. Step 5: Solve for x
    x = 3,380,226.67/2,687.47
  6. Step 6: Final answer
    x = 1,257.77

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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.