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Finding the Fourth Proportional to 171.43, 257.05 and 61.69

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Solution

The fourth proportional to 171.43, 257.05 and 61.69 is: 92.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.43 : 257.05 = 61.69 : x
  2. Step 2: Convert to fraction form
    171.43/257.05 = 61.69/x
  3. Step 3: Cross multiply
    171.43x = 257.05 × 61.69
  4. Step 4: Simplify right side
    171.43x = 15,857.41
  5. Step 5: Solve for x
    x = 15,857.41/171.43
  6. Step 6: Final answer
    x = 92.50

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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.