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Finding the Fourth Proportional to 1,286.28, 1,925.82 and 668.64

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Solution

The fourth proportional to 1,286.28, 1,925.82 and 668.64 is: 1,001.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.28 : 1,925.82 = 668.64 : x
  2. Step 2: Convert to fraction form
    1,286.28/1,925.82 = 668.64/x
  3. Step 3: Cross multiply
    1,286.28x = 1,925.82 × 668.64
  4. Step 4: Simplify right side
    1,286.28x = 1,287,680.28
  5. Step 5: Solve for x
    x = 1,287,680.28/1,286.28
  6. Step 6: Final answer
    x = 1,001.09

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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.