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Finding the Fourth Proportional to 171.79, 257.72 and 74.30

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Solution

The fourth proportional to 171.79, 257.72 and 74.30 is: 111.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.79 : 257.72 = 74.30 : x
  2. Step 2: Convert to fraction form
    171.79/257.72 = 74.30/x
  3. Step 3: Cross multiply
    171.79x = 257.72 × 74.30
  4. Step 4: Simplify right side
    171.79x = 19,146.94
  5. Step 5: Solve for x
    x = 19,146.94/171.79
  6. Step 6: Final answer
    x = 111.46

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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.