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Finding the Fourth Proportional to 257.49, 386.46 and 149.13

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Solution

The fourth proportional to 257.49, 386.46 and 149.13 is: 223.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.49 : 386.46 = 149.13 : x
  2. Step 2: Convert to fraction form
    257.49/386.46 = 149.13/x
  3. Step 3: Cross multiply
    257.49x = 386.46 × 149.13
  4. Step 4: Simplify right side
    257.49x = 57,632.78
  5. Step 5: Solve for x
    x = 57,632.78/257.49
  6. Step 6: Final answer
    x = 223.83

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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.