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Finding the Fourth Proportional to 86.10, 118.74 and 57

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Solution

The fourth proportional to 86.10, 118.74 and 57 is: 78.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.10 : 118.74 = 57 : x
  2. Step 2: Convert to fraction form
    86.10/118.74 = 57/x
  3. Step 3: Cross multiply
    86.10x = 118.74 × 57
  4. Step 4: Simplify right side
    86.10x = 6,768.18
  5. Step 5: Solve for x
    x = 6,768.18/86.10
  6. Step 6: Final answer
    x = 78.61

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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.