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Finding the Fourth Proportional to 18,287.10, 27,422.55 and 8,429.40

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Solution

The fourth proportional to 18,287.10, 27,422.55 and 8,429.40 is: 12,640.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,287.10 : 27,422.55 = 8,429.40 : x
  2. Step 2: Convert to fraction form
    18,287.10/27,422.55 = 8,429.40/x
  3. Step 3: Cross multiply
    18,287.10x = 27,422.55 × 8,429.40
  4. Step 4: Simplify right side
    18,287.10x = 231,155,642.97
  5. Step 5: Solve for x
    x = 231,155,642.97/18,287.10
  6. Step 6: Final answer
    x = 12,640.37

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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.