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Finding the Fourth Proportional to 86.43, 118.68 and 75.99

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Solution

The fourth proportional to 86.43, 118.68 and 75.99 is: 104.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.43 : 118.68 = 75.99 : x
  2. Step 2: Convert to fraction form
    86.43/118.68 = 75.99/x
  3. Step 3: Cross multiply
    86.43x = 118.68 × 75.99
  4. Step 4: Simplify right side
    86.43x = 9,018.49
  5. Step 5: Solve for x
    x = 9,018.49/86.43
  6. Step 6: Final answer
    x = 104.34

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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.