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Finding the Fourth Proportional to 139,700.20, 192,812.86 and 79,276.46

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Solution

The fourth proportional to 139,700.20, 192,812.86 and 79,276.46 is: 109,416.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,700.20 : 192,812.86 = 79,276.46 : x
  2. Step 2: Convert to fraction form
    139,700.20/192,812.86 = 79,276.46/x
  3. Step 3: Cross multiply
    139,700.20x = 192,812.86 × 79,276.46
  4. Step 4: Simplify right side
    139,700.20x = 15,285,520,983.28
  5. Step 5: Solve for x
    x = 15,285,520,983.28/139,700.20
  6. Step 6: Final answer
    x = 109,416.60

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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.