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Finding the Fourth Proportional to 27,901.68, 38,471.81 and 20,815.80

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Solution

The fourth proportional to 27,901.68, 38,471.81 and 20,815.80 is: 28,701.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,901.68 : 38,471.81 = 20,815.80 : x
  2. Step 2: Convert to fraction form
    27,901.68/38,471.81 = 20,815.80/x
  3. Step 3: Cross multiply
    27,901.68x = 38,471.81 × 20,815.80
  4. Step 4: Simplify right side
    27,901.68x = 800,821,398.52
  5. Step 5: Solve for x
    x = 800,821,398.52/27,901.68
  6. Step 6: Final answer
    x = 28,701.55

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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.