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Finding the Fourth Proportional to 18,210.70, 27,279.60 and 12,305.80

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Solution

The fourth proportional to 18,210.70, 27,279.60 and 12,305.80 is: 18,434.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,210.70 : 27,279.60 = 12,305.80 : x
  2. Step 2: Convert to fraction form
    18,210.70/27,279.60 = 12,305.80/x
  3. Step 3: Cross multiply
    18,210.70x = 27,279.60 × 12,305.80
  4. Step 4: Simplify right side
    18,210.70x = 335,697,301.68
  5. Step 5: Solve for x
    x = 335,697,301.68/18,210.70
  6. Step 6: Final answer
    x = 18,434.07

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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.