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Finding the Fourth Proportional to 117.19, 161.68 and 78.39

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Solution

The fourth proportional to 117.19, 161.68 and 78.39 is: 108.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.19 : 161.68 = 78.39 : x
  2. Step 2: Convert to fraction form
    117.19/161.68 = 78.39/x
  3. Step 3: Cross multiply
    117.19x = 161.68 × 78.39
  4. Step 4: Simplify right side
    117.19x = 12,674.10
  5. Step 5: Solve for x
    x = 12,674.10/117.19
  6. Step 6: Final answer
    x = 108.15

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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.