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Finding the Fourth Proportional to 191.60, 285.91 and 171.09

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Solution

The fourth proportional to 191.60, 285.91 and 171.09 is: 255.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.60 : 285.91 = 171.09 : x
  2. Step 2: Convert to fraction form
    191.60/285.91 = 171.09/x
  3. Step 3: Cross multiply
    191.60x = 285.91 × 171.09
  4. Step 4: Simplify right side
    191.60x = 48,914.91
  5. Step 5: Solve for x
    x = 48,914.91/191.60
  6. Step 6: Final answer
    x = 255.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.