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Finding the Fourth Proportional to 139.24, 207.90 and 118.94

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Solution

The fourth proportional to 139.24, 207.90 and 118.94 is: 177.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.24 : 207.90 = 118.94 : x
  2. Step 2: Convert to fraction form
    139.24/207.90 = 118.94/x
  3. Step 3: Cross multiply
    139.24x = 207.90 × 118.94
  4. Step 4: Simplify right side
    139.24x = 24,727.63
  5. Step 5: Solve for x
    x = 24,727.63/139.24
  6. Step 6: Final answer
    x = 177.59

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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.