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Finding the Fourth Proportional to 18,761.65, 28,132.08 and 7,676.12

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Solution

The fourth proportional to 18,761.65, 28,132.08 and 7,676.12 is: 11,509.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,761.65 : 28,132.08 = 7,676.12 : x
  2. Step 2: Convert to fraction form
    18,761.65/28,132.08 = 7,676.12/x
  3. Step 3: Cross multiply
    18,761.65x = 28,132.08 × 7,676.12
  4. Step 4: Simplify right side
    18,761.65x = 215,945,221.93
  5. Step 5: Solve for x
    x = 215,945,221.93/18,761.65
  6. Step 6: Final answer
    x = 11,509.93

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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.