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Finding the Fourth Proportional to 18,757.70, 28,136.55 and 7,657.10

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Solution

The fourth proportional to 18,757.70, 28,136.55 and 7,657.10 is: 11,485.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,757.70 : 28,136.55 = 7,657.10 : x
  2. Step 2: Convert to fraction form
    18,757.70/28,136.55 = 7,657.10/x
  3. Step 3: Cross multiply
    18,757.70x = 28,136.55 × 7,657.10
  4. Step 4: Simplify right side
    18,757.70x = 215,444,377.01
  5. Step 5: Solve for x
    x = 215,444,377.01/18,757.70
  6. Step 6: Final answer
    x = 11,485.65

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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.