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Finding the Fourth Proportional to 28,620.80, 39,496.80 and 15,874.88

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Solution

The fourth proportional to 28,620.80, 39,496.80 and 15,874.88 is: 21,907.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,620.80 : 39,496.80 = 15,874.88 : x
  2. Step 2: Convert to fraction form
    28,620.80/39,496.80 = 15,874.88/x
  3. Step 3: Cross multiply
    28,620.80x = 39,496.80 × 15,874.88
  4. Step 4: Simplify right side
    28,620.80x = 627,006,960.38
  5. Step 5: Solve for x
    x = 627,006,960.38/28,620.80
  6. Step 6: Final answer
    x = 21,907.39

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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.