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Finding the Fourth Proportional to 257.25, 385.42 and 148.81

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Solution

The fourth proportional to 257.25, 385.42 and 148.81 is: 222.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.25 : 385.42 = 148.81 : x
  2. Step 2: Convert to fraction form
    257.25/385.42 = 148.81/x
  3. Step 3: Cross multiply
    257.25x = 385.42 × 148.81
  4. Step 4: Simplify right side
    257.25x = 57,354.35
  5. Step 5: Solve for x
    x = 57,354.35/257.25
  6. Step 6: Final answer
    x = 222.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.