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Finding the Fourth Proportional to 139.21, 208.76 and 41.68

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Solution

The fourth proportional to 139.21, 208.76 and 41.68 is: 62.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.21 : 208.76 = 41.68 : x
  2. Step 2: Convert to fraction form
    139.21/208.76 = 41.68/x
  3. Step 3: Cross multiply
    139.21x = 208.76 × 41.68
  4. Step 4: Simplify right side
    139.21x = 8,701.14
  5. Step 5: Solve for x
    x = 8,701.14/139.21
  6. Step 6: Final answer
    x = 62.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.