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Finding the Fourth Proportional to 661.93, 917.82 and 639.97

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Solution

The fourth proportional to 661.93, 917.82 and 639.97 is: 887.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.93 : 917.82 = 639.97 : x
  2. Step 2: Convert to fraction form
    661.93/917.82 = 639.97/x
  3. Step 3: Cross multiply
    661.93x = 917.82 × 639.97
  4. Step 4: Simplify right side
    661.93x = 587,377.94
  5. Step 5: Solve for x
    x = 587,377.94/661.93
  6. Step 6: Final answer
    x = 887.38

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.