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Finding the Fourth Proportional to 2,815, 3,884.70 and 1,711

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Solution

The fourth proportional to 2,815, 3,884.70 and 1,711 is: 2,361.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815 : 3,884.70 = 1,711 : x
  2. Step 2: Convert to fraction form
    2,815/3,884.70 = 1,711/x
  3. Step 3: Cross multiply
    2,815x = 3,884.70 × 1,711
  4. Step 4: Simplify right side
    2,815x = 6,646,721.70
  5. Step 5: Solve for x
    x = 6,646,721.70/2,815
  6. Step 6: Final answer
    x = 2,361.18

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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.