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Finding the Fourth Proportional to 257.74, 386.70 and 120.79

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Solution

The fourth proportional to 257.74, 386.70 and 120.79 is: 181.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.74 : 386.70 = 120.79 : x
  2. Step 2: Convert to fraction form
    257.74/386.70 = 120.79/x
  3. Step 3: Cross multiply
    257.74x = 386.70 × 120.79
  4. Step 4: Simplify right side
    257.74x = 46,709.49
  5. Step 5: Solve for x
    x = 46,709.49/257.74
  6. Step 6: Final answer
    x = 181.23

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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.