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Finding the Fourth Proportional to 100,738.88, 139,021.44 and 55,420.64

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Solution

The fourth proportional to 100,738.88, 139,021.44 and 55,420.64 is: 76,481.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,738.88 : 139,021.44 = 55,420.64 : x
  2. Step 2: Convert to fraction form
    100,738.88/139,021.44 = 55,420.64/x
  3. Step 3: Cross multiply
    100,738.88x = 139,021.44 × 55,420.64
  4. Step 4: Simplify right side
    100,738.88x = 7,704,657,178.52
  5. Step 5: Solve for x
    x = 7,704,657,178.52/100,738.88
  6. Step 6: Final answer
    x = 76,481.47

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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.