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Finding the Fourth Proportional to 258.08, 386.93 and 120.93

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Solution

The fourth proportional to 258.08, 386.93 and 120.93 is: 181.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.08 : 386.93 = 120.93 : x
  2. Step 2: Convert to fraction form
    258.08/386.93 = 120.93/x
  3. Step 3: Cross multiply
    258.08x = 386.93 × 120.93
  4. Step 4: Simplify right side
    258.08x = 46,790.84
  5. Step 5: Solve for x
    x = 46,790.84/258.08
  6. Step 6: Final answer
    x = 181.31

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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.