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Finding the Fourth Proportional to 127.20, 190.47 and 83.74

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Solution

The fourth proportional to 127.20, 190.47 and 83.74 is: 125.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.20 : 190.47 = 83.74 : x
  2. Step 2: Convert to fraction form
    127.20/190.47 = 83.74/x
  3. Step 3: Cross multiply
    127.20x = 190.47 × 83.74
  4. Step 4: Simplify right side
    127.20x = 15,949.48
  5. Step 5: Solve for x
    x = 15,949.48/127.20
  6. Step 6: Final answer
    x = 125.39

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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.