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Finding the Fourth Proportional to 86.32, 118.98 and 57.22

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Solution

The fourth proportional to 86.32, 118.98 and 57.22 is: 78.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.32 : 118.98 = 57.22 : x
  2. Step 2: Convert to fraction form
    86.32/118.98 = 57.22/x
  3. Step 3: Cross multiply
    86.32x = 118.98 × 57.22
  4. Step 4: Simplify right side
    86.32x = 6,808.04
  5. Step 5: Solve for x
    x = 6,808.04/86.32
  6. Step 6: Final answer
    x = 78.87

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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.