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Finding the Fourth Proportional to 665.88, 998.60 and 203.68

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Solution

The fourth proportional to 665.88, 998.60 and 203.68 is: 305.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.88 : 998.60 = 203.68 : x
  2. Step 2: Convert to fraction form
    665.88/998.60 = 203.68/x
  3. Step 3: Cross multiply
    665.88x = 998.60 × 203.68
  4. Step 4: Simplify right side
    665.88x = 203,394.85
  5. Step 5: Solve for x
    x = 203,394.85/665.88
  6. Step 6: Final answer
    x = 305.45

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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.