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Finding the Fourth Proportional to 28,638.68, 39,520 and 15,891.71

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Solution

The fourth proportional to 28,638.68, 39,520 and 15,891.71 is: 21,929.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,638.68 : 39,520 = 15,891.71 : x
  2. Step 2: Convert to fraction form
    28,638.68/39,520 = 15,891.71/x
  3. Step 3: Cross multiply
    28,638.68x = 39,520 × 15,891.71
  4. Step 4: Simplify right side
    28,638.68x = 628,040,181.60
  5. Step 5: Solve for x
    x = 628,040,181.60/28,638.68
  6. Step 6: Final answer
    x = 21,929.79

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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.