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Finding the Fourth Proportional to 661.20, 991.49 and 352.97

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Solution

The fourth proportional to 661.20, 991.49 and 352.97 is: 529.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.20 : 991.49 = 352.97 : x
  2. Step 2: Convert to fraction form
    661.20/991.49 = 352.97/x
  3. Step 3: Cross multiply
    661.20x = 991.49 × 352.97
  4. Step 4: Simplify right side
    661.20x = 349,968.09
  5. Step 5: Solve for x
    x = 349,968.09/661.20
  6. Step 6: Final answer
    x = 529.29

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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.