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Finding the Fourth Proportional to 100,908.63, 139,264.84 and 55,591.25

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Solution

The fourth proportional to 100,908.63, 139,264.84 and 55,591.25 is: 76,721.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,908.63 : 139,264.84 = 55,591.25 : x
  2. Step 2: Convert to fraction form
    100,908.63/139,264.84 = 55,591.25/x
  3. Step 3: Cross multiply
    100,908.63x = 139,264.84 × 55,591.25
  4. Step 4: Simplify right side
    100,908.63x = 7,741,907,023.79
  5. Step 5: Solve for x
    x = 7,741,907,023.79/100,908.63
  6. Step 6: Final answer
    x = 76,721.95

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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.