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Finding the Fourth Proportional to 101,438.86, 139,938.46 and 65,640.44

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Solution

The fourth proportional to 101,438.86, 139,938.46 and 65,640.44 is: 90,553.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,438.86 : 139,938.46 = 65,640.44 : x
  2. Step 2: Convert to fraction form
    101,438.86/139,938.46 = 65,640.44/x
  3. Step 3: Cross multiply
    101,438.86x = 139,938.46 × 65,640.44
  4. Step 4: Simplify right side
    101,438.86x = 9,185,622,087.32
  5. Step 5: Solve for x
    x = 9,185,622,087.32/101,438.86
  6. Step 6: Final answer
    x = 90,553.29

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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.