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Finding the Fourth Proportional to 2,581.25, 3,871.92 and 916.70

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Solution

The fourth proportional to 2,581.25, 3,871.92 and 916.70 is: 1,375.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,581.25 : 3,871.92 = 916.70 : x
  2. Step 2: Convert to fraction form
    2,581.25/3,871.92 = 916.70/x
  3. Step 3: Cross multiply
    2,581.25x = 3,871.92 × 916.70
  4. Step 4: Simplify right side
    2,581.25x = 3,549,369.70
  5. Step 5: Solve for x
    x = 3,549,369.70/2,581.25
  6. Step 6: Final answer
    x = 1,375.06

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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.