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Finding the Fourth Proportional to 279.21, 385.29 and 168.66

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Solution

The fourth proportional to 279.21, 385.29 and 168.66 is: 232.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.21 : 385.29 = 168.66 : x
  2. Step 2: Convert to fraction form
    279.21/385.29 = 168.66/x
  3. Step 3: Cross multiply
    279.21x = 385.29 × 168.66
  4. Step 4: Simplify right side
    279.21x = 64,984.26
  5. Step 5: Solve for x
    x = 64,984.26/279.21
  6. Step 6: Final answer
    x = 232.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.