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Finding the Fourth Proportional to 257.40, 354.87 and 191.70

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Solution

The fourth proportional to 257.40, 354.87 and 191.70 is: 264.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.40 : 354.87 = 191.70 : x
  2. Step 2: Convert to fraction form
    257.40/354.87 = 191.70/x
  3. Step 3: Cross multiply
    257.40x = 354.87 × 191.70
  4. Step 4: Simplify right side
    257.40x = 68,028.58
  5. Step 5: Solve for x
    x = 68,028.58/257.40
  6. Step 6: Final answer
    x = 264.29

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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.