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Finding the Fourth Proportional to 139.06, 207.34 and 136.63

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Solution

The fourth proportional to 139.06, 207.34 and 136.63 is: 203.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.06 : 207.34 = 136.63 : x
  2. Step 2: Convert to fraction form
    139.06/207.34 = 136.63/x
  3. Step 3: Cross multiply
    139.06x = 207.34 × 136.63
  4. Step 4: Simplify right side
    139.06x = 28,328.86
  5. Step 5: Solve for x
    x = 28,328.86/139.06
  6. Step 6: Final answer
    x = 203.72

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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.