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Finding the Fourth Proportional to 18,612.60, 27,909.30 and 6,919.80

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Solution

The fourth proportional to 18,612.60, 27,909.30 and 6,919.80 is: 10,376.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,612.60 : 27,909.30 = 6,919.80 : x
  2. Step 2: Convert to fraction form
    18,612.60/27,909.30 = 6,919.80/x
  3. Step 3: Cross multiply
    18,612.60x = 27,909.30 × 6,919.80
  4. Step 4: Simplify right side
    18,612.60x = 193,126,774.14
  5. Step 5: Solve for x
    x = 193,126,774.14/18,612.60
  6. Step 6: Final answer
    x = 10,376.13

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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.