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Finding the Fourth Proportional to 101,042.13, 139,438.80 and 55,721.82

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Solution

The fourth proportional to 101,042.13, 139,438.80 and 55,721.82 is: 76,896.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,042.13 : 139,438.80 = 55,721.82 : x
  2. Step 2: Convert to fraction form
    101,042.13/139,438.80 = 55,721.82/x
  3. Step 3: Cross multiply
    101,042.13x = 139,438.80 × 55,721.82
  4. Step 4: Simplify right side
    101,042.13x = 7,769,783,714.62
  5. Step 5: Solve for x
    x = 7,769,783,714.62/101,042.13
  6. Step 6: Final answer
    x = 76,896.48

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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.