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Finding the Fourth Proportional to 85,077.66, 126,743.42 and 81,239.48

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Solution

The fourth proportional to 85,077.66, 126,743.42 and 81,239.48 is: 121,025.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,077.66 : 126,743.42 = 81,239.48 : x
  2. Step 2: Convert to fraction form
    85,077.66/126,743.42 = 81,239.48/x
  3. Step 3: Cross multiply
    85,077.66x = 126,743.42 × 81,239.48
  4. Step 4: Simplify right side
    85,077.66x = 10,296,569,534.22
  5. Step 5: Solve for x
    x = 10,296,569,534.22/85,077.66
  6. Step 6: Final answer
    x = 121,025.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.