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Finding the Fourth Proportional to 78,656.63, 108,515.36 and 51,813.23

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Solution

The fourth proportional to 78,656.63, 108,515.36 and 51,813.23 is: 71,481.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,656.63 : 108,515.36 = 51,813.23 : x
  2. Step 2: Convert to fraction form
    78,656.63/108,515.36 = 51,813.23/x
  3. Step 3: Cross multiply
    78,656.63x = 108,515.36 × 51,813.23
  4. Step 4: Simplify right side
    78,656.63x = 5,622,530,893.17
  5. Step 5: Solve for x
    x = 5,622,530,893.17/78,656.63
  6. Step 6: Final answer
    x = 71,481.97

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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.