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Finding the Fourth Proportional to 139,709.49, 192,793.35 and 79,278.87

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Solution

The fourth proportional to 139,709.49, 192,793.35 and 79,278.87 is: 109,401.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,709.49 : 192,793.35 = 79,278.87 : x
  2. Step 2: Convert to fraction form
    139,709.49/192,793.35 = 79,278.87/x
  3. Step 3: Cross multiply
    139,709.49x = 192,793.35 × 79,278.87
  4. Step 4: Simplify right side
    139,709.49x = 15,284,438,931.51
  5. Step 5: Solve for x
    x = 15,284,438,931.51/139,709.49
  6. Step 6: Final answer
    x = 109,401.58

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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.