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Finding the Fourth Proportional to 938.28, 1,405.86 and 663.82

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Solution

The fourth proportional to 938.28, 1,405.86 and 663.82 is: 994.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.28 : 1,405.86 = 663.82 : x
  2. Step 2: Convert to fraction form
    938.28/1,405.86 = 663.82/x
  3. Step 3: Cross multiply
    938.28x = 1,405.86 × 663.82
  4. Step 4: Simplify right side
    938.28x = 933,237.99
  5. Step 5: Solve for x
    x = 933,237.99/938.28
  6. Step 6: Final answer
    x = 994.63

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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.