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Finding the Fourth Proportional to 100,620.50, 138,856.30 and 55,908.50

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Solution

The fourth proportional to 100,620.50, 138,856.30 and 55,908.50 is: 77,153.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,620.50 : 138,856.30 = 55,908.50 : x
  2. Step 2: Convert to fraction form
    100,620.50/138,856.30 = 55,908.50/x
  3. Step 3: Cross multiply
    100,620.50x = 138,856.30 × 55,908.50
  4. Step 4: Simplify right side
    100,620.50x = 7,763,247,448.55
  5. Step 5: Solve for x
    x = 7,763,247,448.55/100,620.50
  6. Step 6: Final answer
    x = 77,153.74

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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.