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Finding the Fourth Proportional to 257.45, 354.57 and 191.84

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Solution

The fourth proportional to 257.45, 354.57 and 191.84 is: 264.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.45 : 354.57 = 191.84 : x
  2. Step 2: Convert to fraction form
    257.45/354.57 = 191.84/x
  3. Step 3: Cross multiply
    257.45x = 354.57 × 191.84
  4. Step 4: Simplify right side
    257.45x = 68,020.71
  5. Step 5: Solve for x
    x = 68,020.71/257.45
  6. Step 6: Final answer
    x = 264.21

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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.