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Finding the Fourth Proportional to 386.76, 580.20 and 167.22

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Solution

The fourth proportional to 386.76, 580.20 and 167.22 is: 250.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.76 : 580.20 = 167.22 : x
  2. Step 2: Convert to fraction form
    386.76/580.20 = 167.22/x
  3. Step 3: Cross multiply
    386.76x = 580.20 × 167.22
  4. Step 4: Simplify right side
    386.76x = 97,021.04
  5. Step 5: Solve for x
    x = 97,021.04/386.76
  6. Step 6: Final answer
    x = 250.86

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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.