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Finding the Fourth Proportional to 139.32, 207.43 and 137.30

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Solution

The fourth proportional to 139.32, 207.43 and 137.30 is: 204.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.32 : 207.43 = 137.30 : x
  2. Step 2: Convert to fraction form
    139.32/207.43 = 137.30/x
  3. Step 3: Cross multiply
    139.32x = 207.43 × 137.30
  4. Step 4: Simplify right side
    139.32x = 28,478.76
  5. Step 5: Solve for x
    x = 28,478.76/139.32
  6. Step 6: Final answer
    x = 204.41

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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.