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Finding the Fourth Proportional to 258.28, 387.26 and 104.18

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Solution

The fourth proportional to 258.28, 387.26 and 104.18 is: 156.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.28 : 387.26 = 104.18 : x
  2. Step 2: Convert to fraction form
    258.28/387.26 = 104.18/x
  3. Step 3: Cross multiply
    258.28x = 387.26 × 104.18
  4. Step 4: Simplify right side
    258.28x = 40,342.29
  5. Step 5: Solve for x
    x = 40,342.29/258.28
  6. Step 6: Final answer
    x = 156.20

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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.