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Finding the Fourth Proportional to 21,878.57, 30,239.01 and 19,286.97

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Solution

The fourth proportional to 21,878.57, 30,239.01 and 19,286.97 is: 26,657.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,878.57 : 30,239.01 = 19,286.97 : x
  2. Step 2: Convert to fraction form
    21,878.57/30,239.01 = 19,286.97/x
  3. Step 3: Cross multiply
    21,878.57x = 30,239.01 × 19,286.97
  4. Step 4: Simplify right side
    21,878.57x = 583,218,878.70
  5. Step 5: Solve for x
    x = 583,218,878.70/21,878.57
  6. Step 6: Final answer
    x = 26,657.09

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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.