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Finding the Fourth Proportional to 931.38, 1,395.90 and 443.31

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Solution

The fourth proportional to 931.38, 1,395.90 and 443.31 is: 664.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.38 : 1,395.90 = 443.31 : x
  2. Step 2: Convert to fraction form
    931.38/1,395.90 = 443.31/x
  3. Step 3: Cross multiply
    931.38x = 1,395.90 × 443.31
  4. Step 4: Simplify right side
    931.38x = 618,816.43
  5. Step 5: Solve for x
    x = 618,816.43/931.38
  6. Step 6: Final answer
    x = 664.41

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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.