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Finding the Fourth Proportional to 139.31, 207.64 and 131.63

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Solution

The fourth proportional to 139.31, 207.64 and 131.63 is: 196.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.31 : 207.64 = 131.63 : x
  2. Step 2: Convert to fraction form
    139.31/207.64 = 131.63/x
  3. Step 3: Cross multiply
    139.31x = 207.64 × 131.63
  4. Step 4: Simplify right side
    139.31x = 27,330.78
  5. Step 5: Solve for x
    x = 27,330.78/139.31
  6. Step 6: Final answer
    x = 196.19

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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.