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Finding the Fourth Proportional to 257.93, 355.91 and 145.90

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Solution

The fourth proportional to 257.93, 355.91 and 145.90 is: 201.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.93 : 355.91 = 145.90 : x
  2. Step 2: Convert to fraction form
    257.93/355.91 = 145.90/x
  3. Step 3: Cross multiply
    257.93x = 355.91 × 145.90
  4. Step 4: Simplify right side
    257.93x = 51,927.78
  5. Step 5: Solve for x
    x = 51,927.78/257.93
  6. Step 6: Final answer
    x = 201.33

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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.