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Finding the Fourth Proportional to 191.75, 287.63 and 77.75

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Solution

The fourth proportional to 191.75, 287.63 and 77.75 is: 116.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.75 : 287.63 = 77.75 : x
  2. Step 2: Convert to fraction form
    191.75/287.63 = 77.75/x
  3. Step 3: Cross multiply
    191.75x = 287.63 × 77.75
  4. Step 4: Simplify right side
    191.75x = 22,362.84
  5. Step 5: Solve for x
    x = 22,362.84/191.75
  6. Step 6: Final answer
    x = 116.63

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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.