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Finding the Fourth Proportional to 12,489.80, 18,679.62 and 11,112.80

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Solution

The fourth proportional to 12,489.80, 18,679.62 and 11,112.80 is: 16,620.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.80 : 18,679.62 = 11,112.80 : x
  2. Step 2: Convert to fraction form
    12,489.80/18,679.62 = 11,112.80/x
  3. Step 3: Cross multiply
    12,489.80x = 18,679.62 × 11,112.80
  4. Step 4: Simplify right side
    12,489.80x = 207,582,881.14
  5. Step 5: Solve for x
    x = 207,582,881.14/12,489.80
  6. Step 6: Final answer
    x = 16,620.19

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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.