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Finding the Fourth Proportional to 100,619.30, 138,847.90 and 55,296.30

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Solution

The fourth proportional to 100,619.30, 138,847.90 and 55,296.30 is: 76,305.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,619.30 : 138,847.90 = 55,296.30 : x
  2. Step 2: Convert to fraction form
    100,619.30/138,847.90 = 55,296.30/x
  3. Step 3: Cross multiply
    100,619.30x = 138,847.90 × 55,296.30
  4. Step 4: Simplify right side
    100,619.30x = 7,677,775,132.77
  5. Step 5: Solve for x
    x = 7,677,775,132.77/100,619.30
  6. Step 6: Final answer
    x = 76,305.20

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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.