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Finding the Fourth Proportional to 117.39, 161.97 and 73.74

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Solution

The fourth proportional to 117.39, 161.97 and 73.74 is: 101.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.39 : 161.97 = 73.74 : x
  2. Step 2: Convert to fraction form
    117.39/161.97 = 73.74/x
  3. Step 3: Cross multiply
    117.39x = 161.97 × 73.74
  4. Step 4: Simplify right side
    117.39x = 11,943.67
  5. Step 5: Solve for x
    x = 11,943.67/117.39
  6. Step 6: Final answer
    x = 101.74

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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.