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Finding the Fourth Proportional to 2,149, 3,223.56 and 688.28

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Solution

The fourth proportional to 2,149, 3,223.56 and 688.28 is: 1,032.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,149 : 3,223.56 = 688.28 : x
  2. Step 2: Convert to fraction form
    2,149/3,223.56 = 688.28/x
  3. Step 3: Cross multiply
    2,149x = 3,223.56 × 688.28
  4. Step 4: Simplify right side
    2,149x = 2,218,711.88
  5. Step 5: Solve for x
    x = 2,218,711.88/2,149
  6. Step 6: Final answer
    x = 1,032.44

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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.