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Finding the Fourth Proportional to 139,655.28, 192,691.48 and 79,212

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Solution

The fourth proportional to 139,655.28, 192,691.48 and 79,212 is: 109,293.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,655.28 : 192,691.48 = 79,212 : x
  2. Step 2: Convert to fraction form
    139,655.28/192,691.48 = 79,212/x
  3. Step 3: Cross multiply
    139,655.28x = 192,691.48 × 79,212
  4. Step 4: Simplify right side
    139,655.28x = 15,263,477,513.76
  5. Step 5: Solve for x
    x = 15,263,477,513.76/139,655.28
  6. Step 6: Final answer
    x = 109,293.95

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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.