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Finding the Fourth Proportional to 28,198.25, 38,911.90 and 15,448.89

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Solution

The fourth proportional to 28,198.25, 38,911.90 and 15,448.89 is: 21,318.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,198.25 : 38,911.90 = 15,448.89 : x
  2. Step 2: Convert to fraction form
    28,198.25/38,911.90 = 15,448.89/x
  3. Step 3: Cross multiply
    28,198.25x = 38,911.90 × 15,448.89
  4. Step 4: Simplify right side
    28,198.25x = 601,145,585.55
  5. Step 5: Solve for x
    x = 601,145,585.55/28,198.25
  6. Step 6: Final answer
    x = 21,318.55

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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.