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Finding the Fourth Proportional to 665.21, 998.15 and 356.73

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Solution

The fourth proportional to 665.21, 998.15 and 356.73 is: 535.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.21 : 998.15 = 356.73 : x
  2. Step 2: Convert to fraction form
    665.21/998.15 = 356.73/x
  3. Step 3: Cross multiply
    665.21x = 998.15 × 356.73
  4. Step 4: Simplify right side
    665.21x = 356,068.27
  5. Step 5: Solve for x
    x = 356,068.27/665.21
  6. Step 6: Final answer
    x = 535.28

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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.