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Finding the Fourth Proportional to 18,612.90, 27,924.30 and 8,078.40

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Solution

The fourth proportional to 18,612.90, 27,924.30 and 8,078.40 is: 12,119.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,612.90 : 27,924.30 = 8,078.40 : x
  2. Step 2: Convert to fraction form
    18,612.90/27,924.30 = 8,078.40/x
  3. Step 3: Cross multiply
    18,612.90x = 27,924.30 × 8,078.40
  4. Step 4: Simplify right side
    18,612.90x = 225,583,665.12
  5. Step 5: Solve for x
    x = 225,583,665.12/18,612.90
  6. Step 6: Final answer
    x = 12,119.75

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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.