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Finding the Fourth Proportional to 257.69, 386.67 and 120.71

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Solution

The fourth proportional to 257.69, 386.67 and 120.71 is: 181.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.69 : 386.67 = 120.71 : x
  2. Step 2: Convert to fraction form
    257.69/386.67 = 120.71/x
  3. Step 3: Cross multiply
    257.69x = 386.67 × 120.71
  4. Step 4: Simplify right side
    257.69x = 46,674.94
  5. Step 5: Solve for x
    x = 46,674.94/257.69
  6. Step 6: Final answer
    x = 181.13

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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.