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Finding the Fourth Proportional to 151.13, 208.55 and 82.13

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Solution

The fourth proportional to 151.13, 208.55 and 82.13 is: 113.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.13 : 208.55 = 82.13 : x
  2. Step 2: Convert to fraction form
    151.13/208.55 = 82.13/x
  3. Step 3: Cross multiply
    151.13x = 208.55 × 82.13
  4. Step 4: Simplify right side
    151.13x = 17,127.37
  5. Step 5: Solve for x
    x = 17,127.37/151.13
  6. Step 6: Final answer
    x = 113.33

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Why These Related Problems?

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