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Finding the Fourth Proportional to 18,287.10, 27,422.55 and 8,421.30

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Solution

The fourth proportional to 18,287.10, 27,422.55 and 8,421.30 is: 12,628.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,287.10 : 27,422.55 = 8,421.30 : x
  2. Step 2: Convert to fraction form
    18,287.10/27,422.55 = 8,421.30/x
  3. Step 3: Cross multiply
    18,287.10x = 27,422.55 × 8,421.30
  4. Step 4: Simplify right side
    18,287.10x = 230,933,520.32
  5. Step 5: Solve for x
    x = 230,933,520.32/18,287.10
  6. Step 6: Final answer
    x = 12,628.22

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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.