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Finding the Fourth Proportional to 139.37, 207.87 and 117.86

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Solution

The fourth proportional to 139.37, 207.87 and 117.86 is: 175.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.37 : 207.87 = 117.86 : x
  2. Step 2: Convert to fraction form
    139.37/207.87 = 117.86/x
  3. Step 3: Cross multiply
    139.37x = 207.87 × 117.86
  4. Step 4: Simplify right side
    139.37x = 24,498.08
  5. Step 5: Solve for x
    x = 24,498.08/139.37
  6. Step 6: Final answer
    x = 175.78

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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.