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Finding the Fourth Proportional to 139,886.21, 209,859.14 and 45,121.71

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Solution

The fourth proportional to 139,886.21, 209,859.14 and 45,121.71 is: 67,692.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,886.21 : 209,859.14 = 45,121.71 : x
  2. Step 2: Convert to fraction form
    139,886.21/209,859.14 = 45,121.71/x
  3. Step 3: Cross multiply
    139,886.21x = 209,859.14 × 45,121.71
  4. Step 4: Simplify right side
    139,886.21x = 9,469,203,255.93
  5. Step 5: Solve for x
    x = 9,469,203,255.93/139,886.21
  6. Step 6: Final answer
    x = 67,692.19

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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.