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Finding the Fourth Proportional to 1,286.66, 1,929.68 and 738.56

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Solution

The fourth proportional to 1,286.66, 1,929.68 and 738.56 is: 1,107.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.66 : 1,929.68 = 738.56 : x
  2. Step 2: Convert to fraction form
    1,286.66/1,929.68 = 738.56/x
  3. Step 3: Cross multiply
    1,286.66x = 1,929.68 × 738.56
  4. Step 4: Simplify right side
    1,286.66x = 1,425,171.12
  5. Step 5: Solve for x
    x = 1,425,171.12/1,286.66
  6. Step 6: Final answer
    x = 1,107.66

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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.