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Finding the Fourth Proportional to 139.55, 207.92 and 134.31

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Solution

The fourth proportional to 139.55, 207.92 and 134.31 is: 200.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.55 : 207.92 = 134.31 : x
  2. Step 2: Convert to fraction form
    139.55/207.92 = 134.31/x
  3. Step 3: Cross multiply
    139.55x = 207.92 × 134.31
  4. Step 4: Simplify right side
    139.55x = 27,925.06
  5. Step 5: Solve for x
    x = 27,925.06/139.55
  6. Step 6: Final answer
    x = 200.12

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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.