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Finding the Fourth Proportional to 117.37, 175.90 and 78.79

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Solution

The fourth proportional to 117.37, 175.90 and 78.79 is: 118.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.37 : 175.90 = 78.79 : x
  2. Step 2: Convert to fraction form
    117.37/175.90 = 78.79/x
  3. Step 3: Cross multiply
    117.37x = 175.90 × 78.79
  4. Step 4: Simplify right side
    117.37x = 13,859.70
  5. Step 5: Solve for x
    x = 13,859.70/117.37
  6. Step 6: Final answer
    x = 118.09

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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.