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Finding the Fourth Proportional to 257.17, 354.98 and 191.77

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Solution

The fourth proportional to 257.17, 354.98 and 191.77 is: 264.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.17 : 354.98 = 191.77 : x
  2. Step 2: Convert to fraction form
    257.17/354.98 = 191.77/x
  3. Step 3: Cross multiply
    257.17x = 354.98 × 191.77
  4. Step 4: Simplify right side
    257.17x = 68,074.51
  5. Step 5: Solve for x
    x = 68,074.51/257.17
  6. Step 6: Final answer
    x = 264.71

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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.