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Finding the Fourth Proportional to 258.17, 355.79 and 188.24

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Solution

The fourth proportional to 258.17, 355.79 and 188.24 is: 259.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.17 : 355.79 = 188.24 : x
  2. Step 2: Convert to fraction form
    258.17/355.79 = 188.24/x
  3. Step 3: Cross multiply
    258.17x = 355.79 × 188.24
  4. Step 4: Simplify right side
    258.17x = 66,971.19
  5. Step 5: Solve for x
    x = 66,971.19/258.17
  6. Step 6: Final answer
    x = 259.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.