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Finding the Fourth Proportional to 79,520.80, 109,723.20 and 51,222.40

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Solution

The fourth proportional to 79,520.80, 109,723.20 and 51,222.40 is: 70,676.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,520.80 : 109,723.20 = 51,222.40 : x
  2. Step 2: Convert to fraction form
    79,520.80/109,723.20 = 51,222.40/x
  3. Step 3: Cross multiply
    79,520.80x = 109,723.20 × 51,222.40
  4. Step 4: Simplify right side
    79,520.80x = 5,620,285,639.68
  5. Step 5: Solve for x
    x = 5,620,285,639.68/79,520.80
  6. Step 6: Final answer
    x = 70,676.93

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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.