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Finding the Fourth Proportional to 738.63, 1,107.91 and 299.76

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Solution

The fourth proportional to 738.63, 1,107.91 and 299.76 is: 449.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.63 : 1,107.91 = 299.76 : x
  2. Step 2: Convert to fraction form
    738.63/1,107.91 = 299.76/x
  3. Step 3: Cross multiply
    738.63x = 1,107.91 × 299.76
  4. Step 4: Simplify right side
    738.63x = 332,107.10
  5. Step 5: Solve for x
    x = 332,107.10/738.63
  6. Step 6: Final answer
    x = 449.63

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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.