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Finding the Fourth Proportional to 738.71, 1,107.28 and 391.83

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Solution

The fourth proportional to 738.71, 1,107.28 and 391.83 is: 587.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.71 : 1,107.28 = 391.83 : x
  2. Step 2: Convert to fraction form
    738.71/1,107.28 = 391.83/x
  3. Step 3: Cross multiply
    738.71x = 1,107.28 × 391.83
  4. Step 4: Simplify right side
    738.71x = 433,863.56
  5. Step 5: Solve for x
    x = 433,863.56/738.71
  6. Step 6: Final answer
    x = 587.33

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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.