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Finding the Fourth Proportional to 167.99, 251.98 and 86.78

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Solution

The fourth proportional to 167.99, 251.98 and 86.78 is: 130.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.99 : 251.98 = 86.78 : x
  2. Step 2: Convert to fraction form
    167.99/251.98 = 86.78/x
  3. Step 3: Cross multiply
    167.99x = 251.98 × 86.78
  4. Step 4: Simplify right side
    167.99x = 21,866.82
  5. Step 5: Solve for x
    x = 21,866.82/167.99
  6. Step 6: Final answer
    x = 130.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.