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Finding the Fourth Proportional to 171.35, 256.91 and 79.99

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Solution

The fourth proportional to 171.35, 256.91 and 79.99 is: 119.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.35 : 256.91 = 79.99 : x
  2. Step 2: Convert to fraction form
    171.35/256.91 = 79.99/x
  3. Step 3: Cross multiply
    171.35x = 256.91 × 79.99
  4. Step 4: Simplify right side
    171.35x = 20,549.19
  5. Step 5: Solve for x
    x = 20,549.19/171.35
  6. Step 6: Final answer
    x = 119.93

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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.