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Finding the Fourth Proportional to 100,891.64, 139,163.80 and 63,100.28

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Solution

The fourth proportional to 100,891.64, 139,163.80 and 63,100.28 is: 87,036.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,891.64 : 139,163.80 = 63,100.28 : x
  2. Step 2: Convert to fraction form
    100,891.64/139,163.80 = 63,100.28/x
  3. Step 3: Cross multiply
    100,891.64x = 139,163.80 × 63,100.28
  4. Step 4: Simplify right side
    100,891.64x = 8,781,274,745.86
  5. Step 5: Solve for x
    x = 8,781,274,745.86/100,891.64
  6. Step 6: Final answer
    x = 87,036.69

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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.