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Finding the Fourth Proportional to 139,224, 192,129.12 and 79,619.52

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Solution

The fourth proportional to 139,224, 192,129.12 and 79,619.52 is: 109,874.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,224 : 192,129.12 = 79,619.52 : x
  2. Step 2: Convert to fraction form
    139,224/192,129.12 = 79,619.52/x
  3. Step 3: Cross multiply
    139,224x = 192,129.12 × 79,619.52
  4. Step 4: Simplify right side
    139,224x = 15,297,228,312.42
  5. Step 5: Solve for x
    x = 15,297,228,312.42/139,224
  6. Step 6: Final answer
    x = 109,874.94

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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.