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Finding the Fourth Proportional to 257.42, 355.18 and 146.86

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Solution

The fourth proportional to 257.42, 355.18 and 146.86 is: 202.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.42 : 355.18 = 146.86 : x
  2. Step 2: Convert to fraction form
    257.42/355.18 = 146.86/x
  3. Step 3: Cross multiply
    257.42x = 355.18 × 146.86
  4. Step 4: Simplify right side
    257.42x = 52,161.73
  5. Step 5: Solve for x
    x = 52,161.73/257.42
  6. Step 6: Final answer
    x = 202.63

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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.