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Finding the Fourth Proportional to 20,482.80, 30,716.52 and 8,790

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Solution

The fourth proportional to 20,482.80, 30,716.52 and 8,790 is: 13,181.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,482.80 : 30,716.52 = 8,790 : x
  2. Step 2: Convert to fraction form
    20,482.80/30,716.52 = 8,790/x
  3. Step 3: Cross multiply
    20,482.80x = 30,716.52 × 8,790
  4. Step 4: Simplify right side
    20,482.80x = 269,998,210.80
  5. Step 5: Solve for x
    x = 269,998,210.80/20,482.80
  6. Step 6: Final answer
    x = 13,181.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.