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Finding the Fourth Proportional to 17,920.80, 26,856.90 and 11,980.80

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Solution

The fourth proportional to 17,920.80, 26,856.90 and 11,980.80 is: 17,954.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,920.80 : 26,856.90 = 11,980.80 : x
  2. Step 2: Convert to fraction form
    17,920.80/26,856.90 = 11,980.80/x
  3. Step 3: Cross multiply
    17,920.80x = 26,856.90 × 11,980.80
  4. Step 4: Simplify right side
    17,920.80x = 321,767,147.52
  5. Step 5: Solve for x
    x = 321,767,147.52/17,920.80
  6. Step 6: Final answer
    x = 17,954.95

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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.