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Finding the Fourth Proportional to 117.69, 176.36 and 91.95

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Solution

The fourth proportional to 117.69, 176.36 and 91.95 is: 137.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.69 : 176.36 = 91.95 : x
  2. Step 2: Convert to fraction form
    117.69/176.36 = 91.95/x
  3. Step 3: Cross multiply
    117.69x = 176.36 × 91.95
  4. Step 4: Simplify right side
    117.69x = 16,215.84
  5. Step 5: Solve for x
    x = 16,215.84/117.69
  6. Step 6: Final answer
    x = 137.78

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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.