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Finding the Fourth Proportional to 85.23, 127.31 and 72.33

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Solution

The fourth proportional to 85.23, 127.31 and 72.33 is: 108.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.23 : 127.31 = 72.33 : x
  2. Step 2: Convert to fraction form
    85.23/127.31 = 72.33/x
  3. Step 3: Cross multiply
    85.23x = 127.31 × 72.33
  4. Step 4: Simplify right side
    85.23x = 9,208.51
  5. Step 5: Solve for x
    x = 9,208.51/85.23
  6. Step 6: Final answer
    x = 108.04

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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.