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Finding the Fourth Proportional to 86.46, 119.43 and 79.26

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Solution

The fourth proportional to 86.46, 119.43 and 79.26 is: 109.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.46 : 119.43 = 79.26 : x
  2. Step 2: Convert to fraction form
    86.46/119.43 = 79.26/x
  3. Step 3: Cross multiply
    86.46x = 119.43 × 79.26
  4. Step 4: Simplify right side
    86.46x = 9,466.02
  5. Step 5: Solve for x
    x = 9,466.02/86.46
  6. Step 6: Final answer
    x = 109.48

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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.