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Finding the Fourth Proportional to 171.30, 256.65 and 140.70

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Solution

The fourth proportional to 171.30, 256.65 and 140.70 is: 210.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.30 : 256.65 = 140.70 : x
  2. Step 2: Convert to fraction form
    171.30/256.65 = 140.70/x
  3. Step 3: Cross multiply
    171.30x = 256.65 × 140.70
  4. Step 4: Simplify right side
    171.30x = 36,110.66
  5. Step 5: Solve for x
    x = 36,110.66/171.30
  6. Step 6: Final answer
    x = 210.80

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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.