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Finding the Fourth Proportional to 665.50, 998.05 and 203.15

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Solution

The fourth proportional to 665.50, 998.05 and 203.15 is: 304.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.50 : 998.05 = 203.15 : x
  2. Step 2: Convert to fraction form
    665.50/998.05 = 203.15/x
  3. Step 3: Cross multiply
    665.50x = 998.05 × 203.15
  4. Step 4: Simplify right side
    665.50x = 202,754.95
  5. Step 5: Solve for x
    x = 202,754.95/665.50
  6. Step 6: Final answer
    x = 304.67

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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.