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Finding the Fourth Proportional to 257.45, 355.25 and 145.43

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Solution

The fourth proportional to 257.45, 355.25 and 145.43 is: 200.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.45 : 355.25 = 145.43 : x
  2. Step 2: Convert to fraction form
    257.45/355.25 = 145.43/x
  3. Step 3: Cross multiply
    257.45x = 355.25 × 145.43
  4. Step 4: Simplify right side
    257.45x = 51,663.93
  5. Step 5: Solve for x
    x = 51,663.93/257.45
  6. Step 6: Final answer
    x = 200.68

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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.