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Finding the Fourth Proportional to 2,129.90, 3,195.17 and 668.91

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Solution

The fourth proportional to 2,129.90, 3,195.17 and 668.91 is: 1,003.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.90 : 3,195.17 = 668.91 : x
  2. Step 2: Convert to fraction form
    2,129.90/3,195.17 = 668.91/x
  3. Step 3: Cross multiply
    2,129.90x = 3,195.17 × 668.91
  4. Step 4: Simplify right side
    2,129.90x = 2,137,277.82
  5. Step 5: Solve for x
    x = 2,137,277.82/2,129.90
  6. Step 6: Final answer
    x = 1,003.47

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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.