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Finding the Fourth Proportional to 258.10, 356.34 and 191.72

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Solution

The fourth proportional to 258.10, 356.34 and 191.72 is: 264.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.10 : 356.34 = 191.72 : x
  2. Step 2: Convert to fraction form
    258.10/356.34 = 191.72/x
  3. Step 3: Cross multiply
    258.10x = 356.34 × 191.72
  4. Step 4: Simplify right side
    258.10x = 68,317.50
  5. Step 5: Solve for x
    x = 68,317.50/258.10
  6. Step 6: Final answer
    x = 264.69

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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.