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Finding the Fourth Proportional to 257.45, 386.07 and 120.39

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Solution

The fourth proportional to 257.45, 386.07 and 120.39 is: 180.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.45 : 386.07 = 120.39 : x
  2. Step 2: Convert to fraction form
    257.45/386.07 = 120.39/x
  3. Step 3: Cross multiply
    257.45x = 386.07 × 120.39
  4. Step 4: Simplify right side
    257.45x = 46,477.07
  5. Step 5: Solve for x
    x = 46,477.07/257.45
  6. Step 6: Final answer
    x = 180.53

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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.