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Finding the Fourth Proportional to 7,987.92, 11,987.28 and 2,793.84

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Solution

The fourth proportional to 7,987.92, 11,987.28 and 2,793.84 is: 4,192.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,987.92 : 11,987.28 = 2,793.84 : x
  2. Step 2: Convert to fraction form
    7,987.92/11,987.28 = 2,793.84/x
  3. Step 3: Cross multiply
    7,987.92x = 11,987.28 × 2,793.84
  4. Step 4: Simplify right side
    7,987.92x = 33,490,542.36
  5. Step 5: Solve for x
    x = 33,490,542.36/7,987.92
  6. Step 6: Final answer
    x = 4,192.65

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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.