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Finding the Fourth Proportional to 79.94, 110.39 and 61.31

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Solution

The fourth proportional to 79.94, 110.39 and 61.31 is: 84.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.94 : 110.39 = 61.31 : x
  2. Step 2: Convert to fraction form
    79.94/110.39 = 61.31/x
  3. Step 3: Cross multiply
    79.94x = 110.39 × 61.31
  4. Step 4: Simplify right side
    79.94x = 6,768.01
  5. Step 5: Solve for x
    x = 6,768.01/79.94
  6. Step 6: Final answer
    x = 84.66

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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.