Home / 100,738.20-139,023.39-55,415.36

Finding the Fourth Proportional to 100,738.20, 139,023.39 and 55,415.36

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Solution

The fourth proportional to 100,738.20, 139,023.39 and 55,415.36 is: 76,475.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,738.20 : 139,023.39 = 55,415.36 : x
  2. Step 2: Convert to fraction form
    100,738.20/139,023.39 = 55,415.36/x
  3. Step 3: Cross multiply
    100,738.20x = 139,023.39 × 55,415.36
  4. Step 4: Simplify right side
    100,738.20x = 7,704,030,666.92
  5. Step 5: Solve for x
    x = 7,704,030,666.92/100,738.20
  6. Step 6: Final answer
    x = 76,475.76

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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.