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Finding the Fourth Proportional to 18,825.40, 28,205.70 and 12,248.20

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Solution

The fourth proportional to 18,825.40, 28,205.70 and 12,248.20 is: 18,351.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,825.40 : 28,205.70 = 12,248.20 : x
  2. Step 2: Convert to fraction form
    18,825.40/28,205.70 = 12,248.20/x
  3. Step 3: Cross multiply
    18,825.40x = 28,205.70 × 12,248.20
  4. Step 4: Simplify right side
    18,825.40x = 345,469,054.74
  5. Step 5: Solve for x
    x = 345,469,054.74/18,825.40
  6. Step 6: Final answer
    x = 18,351.22

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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.