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Finding the Fourth Proportional to 85.09, 127.55 and 56.22

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Solution

The fourth proportional to 85.09, 127.55 and 56.22 is: 84.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.09 : 127.55 = 56.22 : x
  2. Step 2: Convert to fraction form
    85.09/127.55 = 56.22/x
  3. Step 3: Cross multiply
    85.09x = 127.55 × 56.22
  4. Step 4: Simplify right side
    85.09x = 7,170.58
  5. Step 5: Solve for x
    x = 7,170.58/85.09
  6. Step 6: Final answer
    x = 84.27

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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.