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Finding the Fourth Proportional to 738.61, 1,107.69 and 299.71

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Solution

The fourth proportional to 738.61, 1,107.69 and 299.71 is: 449.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.61 : 1,107.69 = 299.71 : x
  2. Step 2: Convert to fraction form
    738.61/1,107.69 = 299.71/x
  3. Step 3: Cross multiply
    738.61x = 1,107.69 × 299.71
  4. Step 4: Simplify right side
    738.61x = 331,985.77
  5. Step 5: Solve for x
    x = 331,985.77/738.61
  6. Step 6: Final answer
    x = 449.47

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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.