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Finding the Fourth Proportional to 665.09, 996.08 and 642.02

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Solution

The fourth proportional to 665.09, 996.08 and 642.02 is: 961.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.09 : 996.08 = 642.02 : x
  2. Step 2: Convert to fraction form
    665.09/996.08 = 642.02/x
  3. Step 3: Cross multiply
    665.09x = 996.08 × 642.02
  4. Step 4: Simplify right side
    665.09x = 639,498.30
  5. Step 5: Solve for x
    x = 639,498.30/665.09
  6. Step 6: Final answer
    x = 961.53

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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.