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Finding the Fourth Proportional to 930.38, 1,395.72 and 443.17

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Solution

The fourth proportional to 930.38, 1,395.72 and 443.17 is: 664.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.38 : 1,395.72 = 443.17 : x
  2. Step 2: Convert to fraction form
    930.38/1,395.72 = 443.17/x
  3. Step 3: Cross multiply
    930.38x = 1,395.72 × 443.17
  4. Step 4: Simplify right side
    930.38x = 618,541.23
  5. Step 5: Solve for x
    x = 618,541.23/930.38
  6. Step 6: Final answer
    x = 664.83

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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.