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Finding the Fourth Proportional to 127.80, 191.70 and 36.50

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Solution

The fourth proportional to 127.80, 191.70 and 36.50 is: 54.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.80 : 191.70 = 36.50 : x
  2. Step 2: Convert to fraction form
    127.80/191.70 = 36.50/x
  3. Step 3: Cross multiply
    127.80x = 191.70 × 36.50
  4. Step 4: Simplify right side
    127.80x = 6,997.05
  5. Step 5: Solve for x
    x = 6,997.05/127.80
  6. Step 6: Final answer
    x = 54.75

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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.