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Finding the Fourth Proportional to 117.80, 162.57 and 68.68

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Solution

The fourth proportional to 117.80, 162.57 and 68.68 is: 94.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.80 : 162.57 = 68.68 : x
  2. Step 2: Convert to fraction form
    117.80/162.57 = 68.68/x
  3. Step 3: Cross multiply
    117.80x = 162.57 × 68.68
  4. Step 4: Simplify right side
    117.80x = 11,165.31
  5. Step 5: Solve for x
    x = 11,165.31/117.80
  6. Step 6: Final answer
    x = 94.78

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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.