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Finding the Fourth Proportional to 171.49, 257.12 and 74.05

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Solution

The fourth proportional to 171.49, 257.12 and 74.05 is: 111.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.49 : 257.12 = 74.05 : x
  2. Step 2: Convert to fraction form
    171.49/257.12 = 74.05/x
  3. Step 3: Cross multiply
    171.49x = 257.12 × 74.05
  4. Step 4: Simplify right side
    171.49x = 19,040.86
  5. Step 5: Solve for x
    x = 19,040.86/171.49
  6. Step 6: Final answer
    x = 111.03

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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.