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Finding the Fourth Proportional to 171.96, 257.59 and 79.28

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Solution

The fourth proportional to 171.96, 257.59 and 79.28 is: 118.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.96 : 257.59 = 79.28 : x
  2. Step 2: Convert to fraction form
    171.96/257.59 = 79.28/x
  3. Step 3: Cross multiply
    171.96x = 257.59 × 79.28
  4. Step 4: Simplify right side
    171.96x = 20,421.51
  5. Step 5: Solve for x
    x = 20,421.51/171.96
  6. Step 6: Final answer
    x = 118.76

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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.