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Finding the Fourth Proportional to 661.25, 991.41 and 250.31

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Solution

The fourth proportional to 661.25, 991.41 and 250.31 is: 375.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.25 : 991.41 = 250.31 : x
  2. Step 2: Convert to fraction form
    661.25/991.41 = 250.31/x
  3. Step 3: Cross multiply
    661.25x = 991.41 × 250.31
  4. Step 4: Simplify right side
    661.25x = 248,154.88
  5. Step 5: Solve for x
    x = 248,154.88/661.25
  6. Step 6: Final answer
    x = 375.28

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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.