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Finding the Fourth Proportional to 162.20, 243.27 and 139.39

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Solution

The fourth proportional to 162.20, 243.27 and 139.39 is: 209.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.20 : 243.27 = 139.39 : x
  2. Step 2: Convert to fraction form
    162.20/243.27 = 139.39/x
  3. Step 3: Cross multiply
    162.20x = 243.27 × 139.39
  4. Step 4: Simplify right side
    162.20x = 33,908.80
  5. Step 5: Solve for x
    x = 33,908.80/162.20
  6. Step 6: Final answer
    x = 209.05

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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.