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Finding the Fourth Proportional to 18,987.50, 28,481.13 and 7,742.79

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Solution

The fourth proportional to 18,987.50, 28,481.13 and 7,742.79 is: 11,614.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,987.50 : 28,481.13 = 7,742.79 : x
  2. Step 2: Convert to fraction form
    18,987.50/28,481.13 = 7,742.79/x
  3. Step 3: Cross multiply
    18,987.50x = 28,481.13 × 7,742.79
  4. Step 4: Simplify right side
    18,987.50x = 220,523,437.59
  5. Step 5: Solve for x
    x = 220,523,437.59/18,987.50
  6. Step 6: Final answer
    x = 11,614.14

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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.