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Finding the Fourth Proportional to 18,905.20, 28,357.80 and 11,906.80

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Solution

The fourth proportional to 18,905.20, 28,357.80 and 11,906.80 is: 17,860.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,905.20 : 28,357.80 = 11,906.80 : x
  2. Step 2: Convert to fraction form
    18,905.20/28,357.80 = 11,906.80/x
  3. Step 3: Cross multiply
    18,905.20x = 28,357.80 × 11,906.80
  4. Step 4: Simplify right side
    18,905.20x = 337,650,653.04
  5. Step 5: Solve for x
    x = 337,650,653.04/18,905.20
  6. Step 6: Final answer
    x = 17,860.20

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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.