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Finding the Fourth Proportional to 86.23, 118.99 and 47.42

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Solution

The fourth proportional to 86.23, 118.99 and 47.42 is: 65.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.23 : 118.99 = 47.42 : x
  2. Step 2: Convert to fraction form
    86.23/118.99 = 47.42/x
  3. Step 3: Cross multiply
    86.23x = 118.99 × 47.42
  4. Step 4: Simplify right side
    86.23x = 5,641.97
  5. Step 5: Solve for x
    x = 5,641.97/86.23
  6. Step 6: Final answer
    x = 65.43

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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.