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Finding the Fourth Proportional to 72,186.20, 108,149.70 and 61,818.20

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Solution

The fourth proportional to 72,186.20, 108,149.70 and 61,818.20 is: 92,616.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,186.20 : 108,149.70 = 61,818.20 : x
  2. Step 2: Convert to fraction form
    72,186.20/108,149.70 = 61,818.20/x
  3. Step 3: Cross multiply
    72,186.20x = 108,149.70 × 61,818.20
  4. Step 4: Simplify right side
    72,186.20x = 6,685,619,784.54
  5. Step 5: Solve for x
    x = 6,685,619,784.54/72,186.20
  6. Step 6: Final answer
    x = 92,616.31

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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.