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Finding the Fourth Proportional to 257.79, 386.70 and 217.41

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Solution

The fourth proportional to 257.79, 386.70 and 217.41 is: 326.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.79 : 386.70 = 217.41 : x
  2. Step 2: Convert to fraction form
    257.79/386.70 = 217.41/x
  3. Step 3: Cross multiply
    257.79x = 386.70 × 217.41
  4. Step 4: Simplify right side
    257.79x = 84,072.45
  5. Step 5: Solve for x
    x = 84,072.45/257.79
  6. Step 6: Final answer
    x = 326.13

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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.