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Finding the Fourth Proportional to 139,267.20, 192,213.28 and 78,841.28

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Solution

The fourth proportional to 139,267.20, 192,213.28 and 78,841.28 is: 108,814.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,267.20 : 192,213.28 = 78,841.28 : x
  2. Step 2: Convert to fraction form
    139,267.20/192,213.28 = 78,841.28/x
  3. Step 3: Cross multiply
    139,267.20x = 192,213.28 × 78,841.28
  4. Step 4: Simplify right side
    139,267.20x = 15,154,341,028.20
  5. Step 5: Solve for x
    x = 15,154,341,028.20/139,267.20
  6. Step 6: Final answer
    x = 108,814.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.