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Finding the Fourth Proportional to 27,988.68, 38,623.68 and 15,891.42

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Solution

The fourth proportional to 27,988.68, 38,623.68 and 15,891.42 is: 21,929.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,988.68 : 38,623.68 = 15,891.42 : x
  2. Step 2: Convert to fraction form
    27,988.68/38,623.68 = 15,891.42/x
  3. Step 3: Cross multiply
    27,988.68x = 38,623.68 × 15,891.42
  4. Step 4: Simplify right side
    27,988.68x = 613,785,120.83
  5. Step 5: Solve for x
    x = 613,785,120.83/27,988.68
  6. Step 6: Final answer
    x = 21,929.76

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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.