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Finding the Fourth Proportional to 257.37, 355.20 and 140.95

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Solution

The fourth proportional to 257.37, 355.20 and 140.95 is: 194.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.37 : 355.20 = 140.95 : x
  2. Step 2: Convert to fraction form
    257.37/355.20 = 140.95/x
  3. Step 3: Cross multiply
    257.37x = 355.20 × 140.95
  4. Step 4: Simplify right side
    257.37x = 50,064.74
  5. Step 5: Solve for x
    x = 50,064.74/257.37
  6. Step 6: Final answer
    x = 194.52

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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.