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Finding the Fourth Proportional to 12,991.89, 19,487.84 and 7,441.39

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Solution

The fourth proportional to 12,991.89, 19,487.84 and 7,441.39 is: 11,162.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991.89 : 19,487.84 = 7,441.39 : x
  2. Step 2: Convert to fraction form
    12,991.89/19,487.84 = 7,441.39/x
  3. Step 3: Cross multiply
    12,991.89x = 19,487.84 × 7,441.39
  4. Step 4: Simplify right side
    12,991.89x = 145,016,617.70
  5. Step 5: Solve for x
    x = 145,016,617.70/12,991.89
  6. Step 6: Final answer
    x = 11,162.09

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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.