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Finding the Fourth Proportional to 18,759.96, 28,139.99 and 7,666.65

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Solution

The fourth proportional to 18,759.96, 28,139.99 and 7,666.65 is: 11,499.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,759.96 : 28,139.99 = 7,666.65 : x
  2. Step 2: Convert to fraction form
    18,759.96/28,139.99 = 7,666.65/x
  3. Step 3: Cross multiply
    18,759.96x = 28,139.99 × 7,666.65
  4. Step 4: Simplify right side
    18,759.96x = 215,739,473.50
  5. Step 5: Solve for x
    x = 215,739,473.50/18,759.96
  6. Step 6: Final answer
    x = 11,499.99

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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.