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Finding the Fourth Proportional to 939.66, 1,299.81 and 731.89

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Solution

The fourth proportional to 939.66, 1,299.81 and 731.89 is: 1,012.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.66 : 1,299.81 = 731.89 : x
  2. Step 2: Convert to fraction form
    939.66/1,299.81 = 731.89/x
  3. Step 3: Cross multiply
    939.66x = 1,299.81 × 731.89
  4. Step 4: Simplify right side
    939.66x = 951,317.94
  5. Step 5: Solve for x
    x = 951,317.94/939.66
  6. Step 6: Final answer
    x = 1,012.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.