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Finding the Fourth Proportional to 171.30, 256.76 and 84.45

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Solution

The fourth proportional to 171.30, 256.76 and 84.45 is: 126.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.30 : 256.76 = 84.45 : x
  2. Step 2: Convert to fraction form
    171.30/256.76 = 84.45/x
  3. Step 3: Cross multiply
    171.30x = 256.76 × 84.45
  4. Step 4: Simplify right side
    171.30x = 21,683.39
  5. Step 5: Solve for x
    x = 21,683.39/171.30
  6. Step 6: Final answer
    x = 126.58

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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.