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Finding the Fourth Proportional to 171.10, 256.64 and 42.85

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Solution

The fourth proportional to 171.10, 256.64 and 42.85 is: 64.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.10 : 256.64 = 42.85 : x
  2. Step 2: Convert to fraction form
    171.10/256.64 = 42.85/x
  3. Step 3: Cross multiply
    171.10x = 256.64 × 42.85
  4. Step 4: Simplify right side
    171.10x = 10,995.74
  5. Step 5: Solve for x
    x = 10,995.74/171.10
  6. Step 6: Final answer
    x = 64.27

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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.