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Finding the Fourth Proportional to 5,687.56, 8,531.34 and 1,989.91

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Solution

The fourth proportional to 5,687.56, 8,531.34 and 1,989.91 is: 2,984.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,687.56 : 8,531.34 = 1,989.91 : x
  2. Step 2: Convert to fraction form
    5,687.56/8,531.34 = 1,989.91/x
  3. Step 3: Cross multiply
    5,687.56x = 8,531.34 × 1,989.91
  4. Step 4: Simplify right side
    5,687.56x = 16,976,598.78
  5. Step 5: Solve for x
    x = 16,976,598.78/5,687.56
  6. Step 6: Final answer
    x = 2,984.87

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Similar ratio
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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.