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Finding the Fourth Proportional to 738.38, 1,107.86 and 391.70

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Solution

The fourth proportional to 738.38, 1,107.86 and 391.70 is: 587.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.38 : 1,107.86 = 391.70 : x
  2. Step 2: Convert to fraction form
    738.38/1,107.86 = 391.70/x
  3. Step 3: Cross multiply
    738.38x = 1,107.86 × 391.70
  4. Step 4: Simplify right side
    738.38x = 433,948.76
  5. Step 5: Solve for x
    x = 433,948.76/738.38
  6. Step 6: Final answer
    x = 587.70

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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.