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Finding the Fourth Proportional to 69,081.81, 103,622.71 and 19,161.91

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Solution

The fourth proportional to 69,081.81, 103,622.71 and 19,161.91 is: 28,742.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,081.81 : 103,622.71 = 19,161.91 : x
  2. Step 2: Convert to fraction form
    69,081.81/103,622.71 = 19,161.91/x
  3. Step 3: Cross multiply
    69,081.81x = 103,622.71 × 19,161.91
  4. Step 4: Simplify right side
    69,081.81x = 1,985,608,688.11
  5. Step 5: Solve for x
    x = 1,985,608,688.11/69,081.81
  6. Step 6: Final answer
    x = 28,742.86

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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.