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Finding the Fourth Proportional to 86.74, 118.93 and 86.62

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Solution

The fourth proportional to 86.74, 118.93 and 86.62 is: 118.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.74 : 118.93 = 86.62 : x
  2. Step 2: Convert to fraction form
    86.74/118.93 = 86.62/x
  3. Step 3: Cross multiply
    86.74x = 118.93 × 86.62
  4. Step 4: Simplify right side
    86.74x = 10,301.72
  5. Step 5: Solve for x
    x = 10,301.72/86.74
  6. Step 6: Final answer
    x = 118.77

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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.