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Finding the Fourth Proportional to 221,205.40, 331,808.10 and 81,064.60

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Solution

The fourth proportional to 221,205.40, 331,808.10 and 81,064.60 is: 121,596.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,205.40 : 331,808.10 = 81,064.60 : x
  2. Step 2: Convert to fraction form
    221,205.40/331,808.10 = 81,064.60/x
  3. Step 3: Cross multiply
    221,205.40x = 331,808.10 × 81,064.60
  4. Step 4: Simplify right side
    221,205.40x = 26,897,890,903.26
  5. Step 5: Solve for x
    x = 26,897,890,903.26/221,205.40
  6. Step 6: Final answer
    x = 121,596.90

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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.