Home / 2,128.12-3,192.17-667.39

Finding the Fourth Proportional to 2,128.12, 3,192.17 and 667.39

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Solution

The fourth proportional to 2,128.12, 3,192.17 and 667.39 is: 1,001.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.12 : 3,192.17 = 667.39 : x
  2. Step 2: Convert to fraction form
    2,128.12/3,192.17 = 667.39/x
  3. Step 3: Cross multiply
    2,128.12x = 3,192.17 × 667.39
  4. Step 4: Simplify right side
    2,128.12x = 2,130,416.02
  5. Step 5: Solve for x
    x = 2,130,416.02/2,128.12
  6. Step 6: Final answer
    x = 1,001.08

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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.