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Finding the Fourth Proportional to 117.63, 176.15 and 91.73

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Solution

The fourth proportional to 117.63, 176.15 and 91.73 is: 137.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.63 : 176.15 = 91.73 : x
  2. Step 2: Convert to fraction form
    117.63/176.15 = 91.73/x
  3. Step 3: Cross multiply
    117.63x = 176.15 × 91.73
  4. Step 4: Simplify right side
    117.63x = 16,158.91
  5. Step 5: Solve for x
    x = 16,158.91/117.63
  6. Step 6: Final answer
    x = 137.37

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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.