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Finding the Fourth Proportional to 662.21, 993.76 and 315.94

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Solution

The fourth proportional to 662.21, 993.76 and 315.94 is: 474.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.21 : 993.76 = 315.94 : x
  2. Step 2: Convert to fraction form
    662.21/993.76 = 315.94/x
  3. Step 3: Cross multiply
    662.21x = 993.76 × 315.94
  4. Step 4: Simplify right side
    662.21x = 313,965.28
  5. Step 5: Solve for x
    x = 313,965.28/662.21
  6. Step 6: Final answer
    x = 474.12

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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.