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Finding the Fourth Proportional to 86.59, 119.60 and 85.86

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Solution

The fourth proportional to 86.59, 119.60 and 85.86 is: 118.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.59 : 119.60 = 85.86 : x
  2. Step 2: Convert to fraction form
    86.59/119.60 = 85.86/x
  3. Step 3: Cross multiply
    86.59x = 119.60 × 85.86
  4. Step 4: Simplify right side
    86.59x = 10,268.99
  5. Step 5: Solve for x
    x = 10,268.99/86.59
  6. Step 6: Final answer
    x = 118.59

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.