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Finding the Fourth Proportional to 191.80, 287.70 and 171.52

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Solution

The fourth proportional to 191.80, 287.70 and 171.52 is: 257.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.80 : 287.70 = 171.52 : x
  2. Step 2: Convert to fraction form
    191.80/287.70 = 171.52/x
  3. Step 3: Cross multiply
    191.80x = 287.70 × 171.52
  4. Step 4: Simplify right side
    191.80x = 49,346.30
  5. Step 5: Solve for x
    x = 49,346.30/191.80
  6. Step 6: Final answer
    x = 257.28

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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.