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Finding the Fourth Proportional to 11,979.90, 17,881.16 and 11,241.18

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Solution

The fourth proportional to 11,979.90, 17,881.16 and 11,241.18 is: 16,778.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,979.90 : 17,881.16 = 11,241.18 : x
  2. Step 2: Convert to fraction form
    11,979.90/17,881.16 = 11,241.18/x
  3. Step 3: Cross multiply
    11,979.90x = 17,881.16 × 11,241.18
  4. Step 4: Simplify right side
    11,979.90x = 201,005,281.96
  5. Step 5: Solve for x
    x = 201,005,281.96/11,979.90
  6. Step 6: Final answer
    x = 16,778.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.