Home / 100,138.50-138,193.30-55,426.50

Finding the Fourth Proportional to 100,138.50, 138,193.30 and 55,426.50

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Solution

The fourth proportional to 100,138.50, 138,193.30 and 55,426.50 is: 76,489.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,138.50 : 138,193.30 = 55,426.50 : x
  2. Step 2: Convert to fraction form
    100,138.50/138,193.30 = 55,426.50/x
  3. Step 3: Cross multiply
    100,138.50x = 138,193.30 × 55,426.50
  4. Step 4: Simplify right side
    100,138.50x = 7,659,570,942.45
  5. Step 5: Solve for x
    x = 7,659,570,942.45/100,138.50
  6. Step 6: Final answer
    x = 76,489.77

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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.