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Finding the Fourth Proportional to 2,128.38, 3,192.62 and 667.64

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Solution

The fourth proportional to 2,128.38, 3,192.62 and 667.64 is: 1,001.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.38 : 3,192.62 = 667.64 : x
  2. Step 2: Convert to fraction form
    2,128.38/3,192.62 = 667.64/x
  3. Step 3: Cross multiply
    2,128.38x = 3,192.62 × 667.64
  4. Step 4: Simplify right side
    2,128.38x = 2,131,525.46
  5. Step 5: Solve for x
    x = 2,131,525.46/2,128.38
  6. Step 6: Final answer
    x = 1,001.48

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1.5x scale

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.