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Finding the Fourth Proportional to 84.58, 127.62 and 81.56

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Solution

The fourth proportional to 84.58, 127.62 and 81.56 is: 123.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.58 : 127.62 = 81.56 : x
  2. Step 2: Convert to fraction form
    84.58/127.62 = 81.56/x
  3. Step 3: Cross multiply
    84.58x = 127.62 × 81.56
  4. Step 4: Simplify right side
    84.58x = 10,408.69
  5. Step 5: Solve for x
    x = 10,408.69/84.58
  6. Step 6: Final answer
    x = 123.06

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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.