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Finding the Fourth Proportional to 171.88, 257.70 and 69.12

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Solution

The fourth proportional to 171.88, 257.70 and 69.12 is: 103.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.88 : 257.70 = 69.12 : x
  2. Step 2: Convert to fraction form
    171.88/257.70 = 69.12/x
  3. Step 3: Cross multiply
    171.88x = 257.70 × 69.12
  4. Step 4: Simplify right side
    171.88x = 17,812.22
  5. Step 5: Solve for x
    x = 17,812.22/171.88
  6. Step 6: Final answer
    x = 103.63

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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.