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Finding the Fourth Proportional to 85.72, 118.06 and 67.36

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Solution

The fourth proportional to 85.72, 118.06 and 67.36 is: 92.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.72 : 118.06 = 67.36 : x
  2. Step 2: Convert to fraction form
    85.72/118.06 = 67.36/x
  3. Step 3: Cross multiply
    85.72x = 118.06 × 67.36
  4. Step 4: Simplify right side
    85.72x = 7,952.52
  5. Step 5: Solve for x
    x = 7,952.52/85.72
  6. Step 6: Final answer
    x = 92.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.