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Finding the Fourth Proportional to 18,136.80, 27,159.12 and 9,919.20

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Solution

The fourth proportional to 18,136.80, 27,159.12 and 9,919.20 is: 14,853.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,136.80 : 27,159.12 = 9,919.20 : x
  2. Step 2: Convert to fraction form
    18,136.80/27,159.12 = 9,919.20/x
  3. Step 3: Cross multiply
    18,136.80x = 27,159.12 × 9,919.20
  4. Step 4: Simplify right side
    18,136.80x = 269,396,743.10
  5. Step 5: Solve for x
    x = 269,396,743.10/18,136.80
  6. Step 6: Final answer
    x = 14,853.60

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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.