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Finding the Fourth Proportional to 661.11, 991.67 and 250.34

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Solution

The fourth proportional to 661.11, 991.67 and 250.34 is: 375.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.11 : 991.67 = 250.34 : x
  2. Step 2: Convert to fraction form
    661.11/991.67 = 250.34/x
  3. Step 3: Cross multiply
    661.11x = 991.67 × 250.34
  4. Step 4: Simplify right side
    661.11x = 248,254.67
  5. Step 5: Solve for x
    x = 248,254.67/661.11
  6. Step 6: Final answer
    x = 375.51

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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.