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Finding the Fourth Proportional to 2,128.71, 3,193.07 and 667.98

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Solution

The fourth proportional to 2,128.71, 3,193.07 and 667.98 is: 1,001.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,128.71 : 3,193.07 = 667.98 : x
  2. Step 2: Convert to fraction form
    2,128.71/3,193.07 = 667.98/x
  3. Step 3: Cross multiply
    2,128.71x = 3,193.07 × 667.98
  4. Step 4: Simplify right side
    2,128.71x = 2,132,887.59
  5. Step 5: Solve for x
    x = 2,132,887.59/2,128.71
  6. Step 6: Final answer
    x = 1,001.96

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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.