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Finding the Fourth Proportional to 86.33, 118.29 and 86.03

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Solution

The fourth proportional to 86.33, 118.29 and 86.03 is: 117.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.33 : 118.29 = 86.03 : x
  2. Step 2: Convert to fraction form
    86.33/118.29 = 86.03/x
  3. Step 3: Cross multiply
    86.33x = 118.29 × 86.03
  4. Step 4: Simplify right side
    86.33x = 10,176.66
  5. Step 5: Solve for x
    x = 10,176.66/86.33
  6. Step 6: Final answer
    x = 117.88

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.