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Finding the Fourth Proportional to 28,168.25, 38,872.19 and 15,422.25

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Solution

The fourth proportional to 28,168.25, 38,872.19 and 15,422.25 is: 21,282.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,168.25 : 38,872.19 = 15,422.25 : x
  2. Step 2: Convert to fraction form
    28,168.25/38,872.19 = 15,422.25/x
  3. Step 3: Cross multiply
    28,168.25x = 38,872.19 × 15,422.25
  4. Step 4: Simplify right side
    28,168.25x = 599,496,773.18
  5. Step 5: Solve for x
    x = 599,496,773.18/28,168.25
  6. Step 6: Final answer
    x = 21,282.72

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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.