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Finding the Fourth Proportional to 279.02, 385.22 and 172.69

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Solution

The fourth proportional to 279.02, 385.22 and 172.69 is: 238.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.02 : 385.22 = 172.69 : x
  2. Step 2: Convert to fraction form
    279.02/385.22 = 172.69/x
  3. Step 3: Cross multiply
    279.02x = 385.22 × 172.69
  4. Step 4: Simplify right side
    279.02x = 66,523.64
  5. Step 5: Solve for x
    x = 66,523.64/279.02
  6. Step 6: Final answer
    x = 238.42

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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.