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Finding the Fourth Proportional to 2,115.51, 3,171.43 and 817.89

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Solution

The fourth proportional to 2,115.51, 3,171.43 and 817.89 is: 1,226.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.51 : 3,171.43 = 817.89 : x
  2. Step 2: Convert to fraction form
    2,115.51/3,171.43 = 817.89/x
  3. Step 3: Cross multiply
    2,115.51x = 3,171.43 × 817.89
  4. Step 4: Simplify right side
    2,115.51x = 2,593,880.88
  5. Step 5: Solve for x
    x = 2,593,880.88/2,115.51
  6. Step 6: Final answer
    x = 1,226.13

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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.