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Finding the Fourth Proportional to 139.38, 210.11 and 131.52

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Solution

The fourth proportional to 139.38, 210.11 and 131.52 is: 198.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.38 : 210.11 = 131.52 : x
  2. Step 2: Convert to fraction form
    139.38/210.11 = 131.52/x
  3. Step 3: Cross multiply
    139.38x = 210.11 × 131.52
  4. Step 4: Simplify right side
    139.38x = 27,633.01
  5. Step 5: Solve for x
    x = 27,633.01/139.38
  6. Step 6: Final answer
    x = 198.26

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.