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Finding the Fourth Proportional to 85.39, 127.80 and 82.22

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Solution

The fourth proportional to 85.39, 127.80 and 82.22 is: 123.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.39 : 127.80 = 82.22 : x
  2. Step 2: Convert to fraction form
    85.39/127.80 = 82.22/x
  3. Step 3: Cross multiply
    85.39x = 127.80 × 82.22
  4. Step 4: Simplify right side
    85.39x = 10,507.08
  5. Step 5: Solve for x
    x = 10,507.08/85.39
  6. Step 6: Final answer
    x = 123.05

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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.