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Finding the Fourth Proportional to 191.28, 285.45 and 170.77

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Solution

The fourth proportional to 191.28, 285.45 and 170.77 is: 254.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.28 : 285.45 = 170.77 : x
  2. Step 2: Convert to fraction form
    191.28/285.45 = 170.77/x
  3. Step 3: Cross multiply
    191.28x = 285.45 × 170.77
  4. Step 4: Simplify right side
    191.28x = 48,746.01
  5. Step 5: Solve for x
    x = 48,746.01/191.28
  6. Step 6: Final answer
    x = 254.85

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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.