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Finding the Fourth Proportional to 7,920.72, 11,884.25 and 2,991.74

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Solution

The fourth proportional to 7,920.72, 11,884.25 and 2,991.74 is: 4,488.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920.72 : 11,884.25 = 2,991.74 : x
  2. Step 2: Convert to fraction form
    7,920.72/11,884.25 = 2,991.74/x
  3. Step 3: Cross multiply
    7,920.72x = 11,884.25 × 2,991.74
  4. Step 4: Simplify right side
    7,920.72x = 35,554,534.15
  5. Step 5: Solve for x
    x = 35,554,534.15/7,920.72
  6. Step 6: Final answer
    x = 4,488.80

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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.