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Finding the Fourth Proportional to 18,612.80, 27,919.20 and 9,864.80

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Solution

The fourth proportional to 18,612.80, 27,919.20 and 9,864.80 is: 14,797.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,612.80 : 27,919.20 = 9,864.80 : x
  2. Step 2: Convert to fraction form
    18,612.80/27,919.20 = 9,864.80/x
  3. Step 3: Cross multiply
    18,612.80x = 27,919.20 × 9,864.80
  4. Step 4: Simplify right side
    18,612.80x = 275,417,324.16
  5. Step 5: Solve for x
    x = 275,417,324.16/18,612.80
  6. Step 6: Final answer
    x = 14,797.20

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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.