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Finding the Fourth Proportional to 657.78, 985.77 and 349.17

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Solution

The fourth proportional to 657.78, 985.77 and 349.17 is: 523.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.78 : 985.77 = 349.17 : x
  2. Step 2: Convert to fraction form
    657.78/985.77 = 349.17/x
  3. Step 3: Cross multiply
    657.78x = 985.77 × 349.17
  4. Step 4: Simplify right side
    657.78x = 344,201.31
  5. Step 5: Solve for x
    x = 344,201.31/657.78
  6. Step 6: Final answer
    x = 523.28

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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.