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Finding the Fourth Proportional to 258.16, 386.82 and 95.74

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Solution

The fourth proportional to 258.16, 386.82 and 95.74 is: 143.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.16 : 386.82 = 95.74 : x
  2. Step 2: Convert to fraction form
    258.16/386.82 = 95.74/x
  3. Step 3: Cross multiply
    258.16x = 386.82 × 95.74
  4. Step 4: Simplify right side
    258.16x = 37,034.15
  5. Step 5: Solve for x
    x = 37,034.15/258.16
  6. Step 6: Final answer
    x = 143.45

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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.