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Finding the Fourth Proportional to 258.13, 387 and 95.81

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Solution

The fourth proportional to 258.13, 387 and 95.81 is: 143.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.13 : 387 = 95.81 : x
  2. Step 2: Convert to fraction form
    258.13/387 = 95.81/x
  3. Step 3: Cross multiply
    258.13x = 387 × 95.81
  4. Step 4: Simplify right side
    258.13x = 37,078.47
  5. Step 5: Solve for x
    x = 37,078.47/258.13
  6. Step 6: Final answer
    x = 143.64

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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.