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Finding the Fourth Proportional to 665.92, 999.10 and 203.72

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Solution

The fourth proportional to 665.92, 999.10 and 203.72 is: 305.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.92 : 999.10 = 203.72 : x
  2. Step 2: Convert to fraction form
    665.92/999.10 = 203.72/x
  3. Step 3: Cross multiply
    665.92x = 999.10 × 203.72
  4. Step 4: Simplify right side
    665.92x = 203,531.91
  5. Step 5: Solve for x
    x = 203,531.91/665.92
  6. Step 6: Final answer
    x = 305.64

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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.