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Finding the Fourth Proportional to 257.53, 355.38 and 145.50

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Solution

The fourth proportional to 257.53, 355.38 and 145.50 is: 200.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.53 : 355.38 = 145.50 : x
  2. Step 2: Convert to fraction form
    257.53/355.38 = 145.50/x
  3. Step 3: Cross multiply
    257.53x = 355.38 × 145.50
  4. Step 4: Simplify right side
    257.53x = 51,707.79
  5. Step 5: Solve for x
    x = 51,707.79/257.53
  6. Step 6: Final answer
    x = 200.78

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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.