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Finding the Fourth Proportional to 139.80, 208.46 and 127.74

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Solution

The fourth proportional to 139.80, 208.46 and 127.74 is: 190.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.80 : 208.46 = 127.74 : x
  2. Step 2: Convert to fraction form
    139.80/208.46 = 127.74/x
  3. Step 3: Cross multiply
    139.80x = 208.46 × 127.74
  4. Step 4: Simplify right side
    139.80x = 26,628.04
  5. Step 5: Solve for x
    x = 26,628.04/139.80
  6. Step 6: Final answer
    x = 190.47

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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.