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Finding the Fourth Proportional to 167.99, 251.81 and 85.57

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Solution

The fourth proportional to 167.99, 251.81 and 85.57 is: 128.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    167.99 : 251.81 = 85.57 : x
  2. Step 2: Convert to fraction form
    167.99/251.81 = 85.57/x
  3. Step 3: Cross multiply
    167.99x = 251.81 × 85.57
  4. Step 4: Simplify right side
    167.99x = 21,547.38
  5. Step 5: Solve for x
    x = 21,547.38/167.99
  6. Step 6: Final answer
    x = 128.27

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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.