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Finding the Fourth Proportional to 27,687.78, 38,208.78 and 15,112.62

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Solution

The fourth proportional to 27,687.78, 38,208.78 and 15,112.62 is: 20,855.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,687.78 : 38,208.78 = 15,112.62 : x
  2. Step 2: Convert to fraction form
    27,687.78/38,208.78 = 15,112.62/x
  3. Step 3: Cross multiply
    27,687.78x = 38,208.78 × 15,112.62
  4. Step 4: Simplify right side
    27,687.78x = 577,434,772.80
  5. Step 5: Solve for x
    x = 577,434,772.80/27,687.78
  6. Step 6: Final answer
    x = 20,855.22

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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.