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Finding the Fourth Proportional to 8,685.97, 11,987.21 and 8,372.27

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Solution

The fourth proportional to 8,685.97, 11,987.21 and 8,372.27 is: 11,554.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,685.97 : 11,987.21 = 8,372.27 : x
  2. Step 2: Convert to fraction form
    8,685.97/11,987.21 = 8,372.27/x
  3. Step 3: Cross multiply
    8,685.97x = 11,987.21 × 8,372.27
  4. Step 4: Simplify right side
    8,685.97x = 100,360,158.67
  5. Step 5: Solve for x
    x = 100,360,158.67/8,685.97
  6. Step 6: Final answer
    x = 11,554.28

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Half scale
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.