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Finding the Fourth Proportional to 1,531.87, 2,114.05 and 868.68

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Solution

The fourth proportional to 1,531.87, 2,114.05 and 868.68 is: 1,198.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,531.87 : 2,114.05 = 868.68 : x
  2. Step 2: Convert to fraction form
    1,531.87/2,114.05 = 868.68/x
  3. Step 3: Cross multiply
    1,531.87x = 2,114.05 × 868.68
  4. Step 4: Simplify right side
    1,531.87x = 1,836,432.95
  5. Step 5: Solve for x
    x = 1,836,432.95/1,531.87
  6. Step 6: Final answer
    x = 1,198.82

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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.