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Finding the Fourth Proportional to 18,751.92, 28,129.80 and 7,074.96

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Solution

The fourth proportional to 18,751.92, 28,129.80 and 7,074.96 is: 10,613.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,751.92 : 28,129.80 = 7,074.96 : x
  2. Step 2: Convert to fraction form
    18,751.92/28,129.80 = 7,074.96/x
  3. Step 3: Cross multiply
    18,751.92x = 28,129.80 × 7,074.96
  4. Step 4: Simplify right side
    18,751.92x = 199,017,209.81
  5. Step 5: Solve for x
    x = 199,017,209.81/18,751.92
  6. Step 6: Final answer
    x = 10,613.16

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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.