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Finding the Fourth Proportional to 100,736.89, 139,017.21 and 55,419.52

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Solution

The fourth proportional to 100,736.89, 139,017.21 and 55,419.52 is: 76,479.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,736.89 : 139,017.21 = 55,419.52 : x
  2. Step 2: Convert to fraction form
    100,736.89/139,017.21 = 55,419.52/x
  3. Step 3: Cross multiply
    100,736.89x = 139,017.21 × 55,419.52
  4. Step 4: Simplify right side
    100,736.89x = 7,704,267,049.94
  5. Step 5: Solve for x
    x = 7,704,267,049.94/100,736.89
  6. Step 6: Final answer
    x = 76,479.10

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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.