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Finding the Fourth Proportional to 139,135.21, 208,518.28 and 72,631.27

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Solution

The fourth proportional to 139,135.21, 208,518.28 and 72,631.27 is: 108,850.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,135.21 : 208,518.28 = 72,631.27 : x
  2. Step 2: Convert to fraction form
    139,135.21/208,518.28 = 72,631.27/x
  3. Step 3: Cross multiply
    139,135.21x = 208,518.28 × 72,631.27
  4. Step 4: Simplify right side
    139,135.21x = 15,144,947,494.62
  5. Step 5: Solve for x
    x = 15,144,947,494.62/139,135.21
  6. Step 6: Final answer
    x = 108,850.57

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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.