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Finding the Fourth Proportional to 101,064.25, 139,481.55 and 84,039.20

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Solution

The fourth proportional to 101,064.25, 139,481.55 and 84,039.20 is: 115,984.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,064.25 : 139,481.55 = 84,039.20 : x
  2. Step 2: Convert to fraction form
    101,064.25/139,481.55 = 84,039.20/x
  3. Step 3: Cross multiply
    101,064.25x = 139,481.55 × 84,039.20
  4. Step 4: Simplify right side
    101,064.25x = 11,721,917,179.35
  5. Step 5: Solve for x
    x = 11,721,917,179.35/101,064.25
  6. Step 6: Final answer
    x = 115,984.80

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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.