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Finding the Fourth Proportional to 117.19, 161.64 and 78.37

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Solution

The fourth proportional to 117.19, 161.64 and 78.37 is: 108.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.19 : 161.64 = 78.37 : x
  2. Step 2: Convert to fraction form
    117.19/161.64 = 78.37/x
  3. Step 3: Cross multiply
    117.19x = 161.64 × 78.37
  4. Step 4: Simplify right side
    117.19x = 12,667.73
  5. Step 5: Solve for x
    x = 12,667.73/117.19
  6. Step 6: Final answer
    x = 108.10

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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.