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Finding the Fourth Proportional to 258.18, 387.06 and 121.16

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Solution

The fourth proportional to 258.18, 387.06 and 121.16 is: 181.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.18 : 387.06 = 121.16 : x
  2. Step 2: Convert to fraction form
    258.18/387.06 = 121.16/x
  3. Step 3: Cross multiply
    258.18x = 387.06 × 121.16
  4. Step 4: Simplify right side
    258.18x = 46,896.19
  5. Step 5: Solve for x
    x = 46,896.19/258.18
  6. Step 6: Final answer
    x = 181.64

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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.