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Finding the Fourth Proportional to 161.08, 242 and 139.48

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Solution

The fourth proportional to 161.08, 242 and 139.48 is: 209.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.08 : 242 = 139.48 : x
  2. Step 2: Convert to fraction form
    161.08/242 = 139.48/x
  3. Step 3: Cross multiply
    161.08x = 242 × 139.48
  4. Step 4: Simplify right side
    161.08x = 33,754.16
  5. Step 5: Solve for x
    x = 33,754.16/161.08
  6. Step 6: Final answer
    x = 209.55

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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.