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Finding the Fourth Proportional to 139.30, 208.14 and 136.74

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Solution

The fourth proportional to 139.30, 208.14 and 136.74 is: 204.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.30 : 208.14 = 136.74 : x
  2. Step 2: Convert to fraction form
    139.30/208.14 = 136.74/x
  3. Step 3: Cross multiply
    139.30x = 208.14 × 136.74
  4. Step 4: Simplify right side
    139.30x = 28,461.06
  5. Step 5: Solve for x
    x = 28,461.06/139.30
  6. Step 6: Final answer
    x = 204.31

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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.