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Finding the Fourth Proportional to 78,680.90, 108,619.85 and 53,321.27

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Solution

The fourth proportional to 78,680.90, 108,619.85 and 53,321.27 is: 73,610.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,680.90 : 108,619.85 = 53,321.27 : x
  2. Step 2: Convert to fraction form
    78,680.90/108,619.85 = 53,321.27/x
  3. Step 3: Cross multiply
    78,680.90x = 108,619.85 × 53,321.27
  4. Step 4: Simplify right side
    78,680.90x = 5,791,747,939.41
  5. Step 5: Solve for x
    x = 5,791,747,939.41/78,680.90
  6. Step 6: Final answer
    x = 73,610.59

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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.