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Finding the Fourth Proportional to 117.02, 161.49 and 67.90

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Solution

The fourth proportional to 117.02, 161.49 and 67.90 is: 93.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.02 : 161.49 = 67.90 : x
  2. Step 2: Convert to fraction form
    117.02/161.49 = 67.90/x
  3. Step 3: Cross multiply
    117.02x = 161.49 × 67.90
  4. Step 4: Simplify right side
    117.02x = 10,965.74
  5. Step 5: Solve for x
    x = 10,965.74/117.02
  6. Step 6: Final answer
    x = 93.71

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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.