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Finding the Fourth Proportional to 79.31, 109.41 and 61.94

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Solution

The fourth proportional to 79.31, 109.41 and 61.94 is: 85.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.31 : 109.41 = 61.94 : x
  2. Step 2: Convert to fraction form
    79.31/109.41 = 61.94/x
  3. Step 3: Cross multiply
    79.31x = 109.41 × 61.94
  4. Step 4: Simplify right side
    79.31x = 6,776.86
  5. Step 5: Solve for x
    x = 6,776.86/79.31
  6. Step 6: Final answer
    x = 85.45

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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.