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Finding the Fourth Proportional to 221,259.60, 331,889.40 and 81,072.90

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Solution

The fourth proportional to 221,259.60, 331,889.40 and 81,072.90 is: 121,609.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,259.60 : 331,889.40 = 81,072.90 : x
  2. Step 2: Convert to fraction form
    221,259.60/331,889.40 = 81,072.90/x
  3. Step 3: Cross multiply
    221,259.60x = 331,889.40 × 81,072.90
  4. Step 4: Simplify right side
    221,259.60x = 26,907,236,137.26
  5. Step 5: Solve for x
    x = 26,907,236,137.26/221,259.60
  6. Step 6: Final answer
    x = 121,609.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.