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Finding the Fourth Proportional to 1,531.56, 2,113.85 and 868.44

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Solution

The fourth proportional to 1,531.56, 2,113.85 and 868.44 is: 1,198.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,531.56 : 2,113.85 = 868.44 : x
  2. Step 2: Convert to fraction form
    1,531.56/2,113.85 = 868.44/x
  3. Step 3: Cross multiply
    1,531.56x = 2,113.85 × 868.44
  4. Step 4: Simplify right side
    1,531.56x = 1,835,747.55
  5. Step 5: Solve for x
    x = 1,835,747.55/1,531.56
  6. Step 6: Final answer
    x = 1,198.61

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1.5x scale

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.