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Finding the Fourth Proportional to 139.46, 208.34 and 117.68

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Solution

The fourth proportional to 139.46, 208.34 and 117.68 is: 175.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.46 : 208.34 = 117.68 : x
  2. Step 2: Convert to fraction form
    139.46/208.34 = 117.68/x
  3. Step 3: Cross multiply
    139.46x = 208.34 × 117.68
  4. Step 4: Simplify right side
    139.46x = 24,515.82
  5. Step 5: Solve for x
    x = 24,515.82/139.46
  6. Step 6: Final answer
    x = 175.80

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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.