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Finding the Fourth Proportional to 128.67, 177.53 and 82.08

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Solution

The fourth proportional to 128.67, 177.53 and 82.08 is: 113.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.67 : 177.53 = 82.08 : x
  2. Step 2: Convert to fraction form
    128.67/177.53 = 82.08/x
  3. Step 3: Cross multiply
    128.67x = 177.53 × 82.08
  4. Step 4: Simplify right side
    128.67x = 14,571.25
  5. Step 5: Solve for x
    x = 14,571.25/128.67
  6. Step 6: Final answer
    x = 113.24

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.