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Finding the Fourth Proportional to 139,289.76, 208,969.20 and 40,793.76

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Solution

The fourth proportional to 139,289.76, 208,969.20 and 40,793.76 is: 61,200.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,289.76 : 208,969.20 = 40,793.76 : x
  2. Step 2: Convert to fraction form
    139,289.76/208,969.20 = 40,793.76/x
  3. Step 3: Cross multiply
    139,289.76x = 208,969.20 × 40,793.76
  4. Step 4: Simplify right side
    139,289.76x = 8,524,639,392.19
  5. Step 5: Solve for x
    x = 8,524,639,392.19/139,289.76
  6. Step 6: Final answer
    x = 61,200.76

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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.