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Finding the Fourth Proportional to 2,114.61, 3,171.92 and 864.95

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Solution

The fourth proportional to 2,114.61, 3,171.92 and 864.95 is: 1,297.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,114.61 : 3,171.92 = 864.95 : x
  2. Step 2: Convert to fraction form
    2,114.61/3,171.92 = 864.95/x
  3. Step 3: Cross multiply
    2,114.61x = 3,171.92 × 864.95
  4. Step 4: Simplify right side
    2,114.61x = 2,743,532.02
  5. Step 5: Solve for x
    x = 2,743,532.02/2,114.61
  6. Step 6: Final answer
    x = 1,297.42

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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.