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Finding the Fourth Proportional to 665.21, 997.81 and 372.57

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Solution

The fourth proportional to 665.21, 997.81 and 372.57 is: 558.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.21 : 997.81 = 372.57 : x
  2. Step 2: Convert to fraction form
    665.21/997.81 = 372.57/x
  3. Step 3: Cross multiply
    665.21x = 997.81 × 372.57
  4. Step 4: Simplify right side
    665.21x = 371,753.25
  5. Step 5: Solve for x
    x = 371,753.25/665.21
  6. Step 6: Final answer
    x = 558.85

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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.