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Finding the Fourth Proportional to 161.39, 243.10 and 131.32

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Solution

The fourth proportional to 161.39, 243.10 and 131.32 is: 197.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.39 : 243.10 = 131.32 : x
  2. Step 2: Convert to fraction form
    161.39/243.10 = 131.32/x
  3. Step 3: Cross multiply
    161.39x = 243.10 × 131.32
  4. Step 4: Simplify right side
    161.39x = 31,924.36
  5. Step 5: Solve for x
    x = 31,924.36/161.39
  6. Step 6: Final answer
    x = 197.81

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.