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Finding the Fourth Proportional to 85.59, 127.62 and 81.36

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Solution

The fourth proportional to 85.59, 127.62 and 81.36 is: 121.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.59 : 127.62 = 81.36 : x
  2. Step 2: Convert to fraction form
    85.59/127.62 = 81.36/x
  3. Step 3: Cross multiply
    85.59x = 127.62 × 81.36
  4. Step 4: Simplify right side
    85.59x = 10,383.16
  5. Step 5: Solve for x
    x = 10,383.16/85.59
  6. Step 6: Final answer
    x = 121.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.