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Finding the Fourth Proportional to 3,991.68, 5,987.52 and 3,220.56

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Solution

The fourth proportional to 3,991.68, 5,987.52 and 3,220.56 is: 4,830.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,991.68 : 5,987.52 = 3,220.56 : x
  2. Step 2: Convert to fraction form
    3,991.68/5,987.52 = 3,220.56/x
  3. Step 3: Cross multiply
    3,991.68x = 5,987.52 × 3,220.56
  4. Step 4: Simplify right side
    3,991.68x = 19,283,167.41
  5. Step 5: Solve for x
    x = 19,283,167.41/3,991.68
  6. Step 6: Final answer
    x = 4,830.84

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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.