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Finding the Fourth Proportional to 80,685, 111,345.30 and 47,151

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Solution

The fourth proportional to 80,685, 111,345.30 and 47,151 is: 65,068.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,685 : 111,345.30 = 47,151 : x
  2. Step 2: Convert to fraction form
    80,685/111,345.30 = 47,151/x
  3. Step 3: Cross multiply
    80,685x = 111,345.30 × 47,151
  4. Step 4: Simplify right side
    80,685x = 5,250,042,240.30
  5. Step 5: Solve for x
    x = 5,250,042,240.30/80,685
  6. Step 6: Final answer
    x = 65,068.38

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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.