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Finding the Fourth Proportional to 100,471.50, 138,650.67 and 55,759.50

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Solution

The fourth proportional to 100,471.50, 138,650.67 and 55,759.50 is: 76,948.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,471.50 : 138,650.67 = 55,759.50 : x
  2. Step 2: Convert to fraction form
    100,471.50/138,650.67 = 55,759.50/x
  3. Step 3: Cross multiply
    100,471.50x = 138,650.67 × 55,759.50
  4. Step 4: Simplify right side
    100,471.50x = 7,731,092,033.87
  5. Step 5: Solve for x
    x = 7,731,092,033.87/100,471.50
  6. Step 6: Final answer
    x = 76,948.11

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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.