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Finding the Fourth Proportional to 83.22, 114.66 and 78.63

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Solution

The fourth proportional to 83.22, 114.66 and 78.63 is: 108.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.22 : 114.66 = 78.63 : x
  2. Step 2: Convert to fraction form
    83.22/114.66 = 78.63/x
  3. Step 3: Cross multiply
    83.22x = 114.66 × 78.63
  4. Step 4: Simplify right side
    83.22x = 9,015.72
  5. Step 5: Solve for x
    x = 9,015.72/83.22
  6. Step 6: Final answer
    x = 108.34

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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.