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Finding the Fourth Proportional to 101,005.70, 139,388.81 and 55,685.28

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Solution

The fourth proportional to 101,005.70, 139,388.81 and 55,685.28 is: 76,846.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,005.70 : 139,388.81 = 55,685.28 : x
  2. Step 2: Convert to fraction form
    101,005.70/139,388.81 = 55,685.28/x
  3. Step 3: Cross multiply
    101,005.70x = 139,388.81 × 55,685.28
  4. Step 4: Simplify right side
    101,005.70x = 7,761,904,635.29
  5. Step 5: Solve for x
    x = 7,761,904,635.29/101,005.70
  6. Step 6: Final answer
    x = 76,846.21

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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.