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Finding the Fourth Proportional to 85.14, 128.27 and 67.23

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Solution

The fourth proportional to 85.14, 128.27 and 67.23 is: 101.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.14 : 128.27 = 67.23 : x
  2. Step 2: Convert to fraction form
    85.14/128.27 = 67.23/x
  3. Step 3: Cross multiply
    85.14x = 128.27 × 67.23
  4. Step 4: Simplify right side
    85.14x = 8,623.76
  5. Step 5: Solve for x
    x = 8,623.76/85.14
  6. Step 6: Final answer
    x = 101.29

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.