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Finding the Fourth Proportional to 78.17, 107.61 and 67.19

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Solution

The fourth proportional to 78.17, 107.61 and 67.19 is: 92.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.17 : 107.61 = 67.19 : x
  2. Step 2: Convert to fraction form
    78.17/107.61 = 67.19/x
  3. Step 3: Cross multiply
    78.17x = 107.61 × 67.19
  4. Step 4: Simplify right side
    78.17x = 7,230.32
  5. Step 5: Solve for x
    x = 7,230.32/78.17
  6. Step 6: Final answer
    x = 92.49

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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.