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Finding the Fourth Proportional to 938.46, 1,406.15 and 663.21

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Solution

The fourth proportional to 938.46, 1,406.15 and 663.21 is: 993.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.46 : 1,406.15 = 663.21 : x
  2. Step 2: Convert to fraction form
    938.46/1,406.15 = 663.21/x
  3. Step 3: Cross multiply
    938.46x = 1,406.15 × 663.21
  4. Step 4: Simplify right side
    938.46x = 932,574.40
  5. Step 5: Solve for x
    x = 932,574.40/938.46
  6. Step 6: Final answer
    x = 993.73

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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.