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Finding the Fourth Proportional to 80,405.04, 120,611.34 and 66,339

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Solution

The fourth proportional to 80,405.04, 120,611.34 and 66,339 is: 99,511.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,405.04 : 120,611.34 = 66,339 : x
  2. Step 2: Convert to fraction form
    80,405.04/120,611.34 = 66,339/x
  3. Step 3: Cross multiply
    80,405.04x = 120,611.34 × 66,339
  4. Step 4: Simplify right side
    80,405.04x = 8,001,235,684.26
  5. Step 5: Solve for x
    x = 8,001,235,684.26/80,405.04
  6. Step 6: Final answer
    x = 99,511.62

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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.