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Finding the Fourth Proportional to 80,616.80, 120,779.40 and 65,745.20

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Solution

The fourth proportional to 80,616.80, 120,779.40 and 65,745.20 is: 98,498.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,616.80 : 120,779.40 = 65,745.20 : x
  2. Step 2: Convert to fraction form
    80,616.80/120,779.40 = 65,745.20/x
  3. Step 3: Cross multiply
    80,616.80x = 120,779.40 × 65,745.20
  4. Step 4: Simplify right side
    80,616.80x = 7,940,665,808.88
  5. Step 5: Solve for x
    x = 7,940,665,808.88/80,616.80
  6. Step 6: Final answer
    x = 98,498.90

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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.