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Finding the Fourth Proportional to 257.67, 386.38 and 84.33

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Solution

The fourth proportional to 257.67, 386.38 and 84.33 is: 126.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.67 : 386.38 = 84.33 : x
  2. Step 2: Convert to fraction form
    257.67/386.38 = 84.33/x
  3. Step 3: Cross multiply
    257.67x = 386.38 × 84.33
  4. Step 4: Simplify right side
    257.67x = 32,583.21
  5. Step 5: Solve for x
    x = 32,583.21/257.67
  6. Step 6: Final answer
    x = 126.45

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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.