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Finding the Fourth Proportional to 2,102.75, 3,154.49 and 869.47

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Solution

The fourth proportional to 2,102.75, 3,154.49 and 869.47 is: 1,304.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,102.75 : 3,154.49 = 869.47 : x
  2. Step 2: Convert to fraction form
    2,102.75/3,154.49 = 869.47/x
  3. Step 3: Cross multiply
    2,102.75x = 3,154.49 × 869.47
  4. Step 4: Simplify right side
    2,102.75x = 2,742,718.65
  5. Step 5: Solve for x
    x = 2,742,718.65/2,102.75
  6. Step 6: Final answer
    x = 1,304.35

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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.