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Finding the Fourth Proportional to 7,991.78, 11,987.04 and 2,445.17

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Solution

The fourth proportional to 7,991.78, 11,987.04 and 2,445.17 is: 3,667.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,991.78 : 11,987.04 = 2,445.17 : x
  2. Step 2: Convert to fraction form
    7,991.78/11,987.04 = 2,445.17/x
  3. Step 3: Cross multiply
    7,991.78x = 11,987.04 × 2,445.17
  4. Step 4: Simplify right side
    7,991.78x = 29,310,290.66
  5. Step 5: Solve for x
    x = 29,310,290.66/7,991.78
  6. Step 6: Final answer
    x = 3,667.56

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Double scale
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Similar ratio
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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.