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Finding the Fourth Proportional to 127.87, 191.81 and 66.99

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Solution

The fourth proportional to 127.87, 191.81 and 66.99 is: 100.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.87 : 191.81 = 66.99 : x
  2. Step 2: Convert to fraction form
    127.87/191.81 = 66.99/x
  3. Step 3: Cross multiply
    127.87x = 191.81 × 66.99
  4. Step 4: Simplify right side
    127.87x = 12,849.35
  5. Step 5: Solve for x
    x = 12,849.35/127.87
  6. Step 6: Final answer
    x = 100.49

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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.