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Finding the Fourth Proportional to 19,761.80, 27,260.66 and 12,209.80

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Solution

The fourth proportional to 19,761.80, 27,260.66 and 12,209.80 is: 16,842.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,761.80 : 27,260.66 = 12,209.80 : x
  2. Step 2: Convert to fraction form
    19,761.80/27,260.66 = 12,209.80/x
  3. Step 3: Cross multiply
    19,761.80x = 27,260.66 × 12,209.80
  4. Step 4: Simplify right side
    19,761.80x = 332,847,206.47
  5. Step 5: Solve for x
    x = 332,847,206.47/19,761.80
  6. Step 6: Final answer
    x = 16,842.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.