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Finding the Fourth Proportional to 80,617.30, 120,780.15 and 65,745.70

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Solution

The fourth proportional to 80,617.30, 120,780.15 and 65,745.70 is: 98,499.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,617.30 : 120,780.15 = 65,745.70 : x
  2. Step 2: Convert to fraction form
    80,617.30/120,780.15 = 65,745.70/x
  3. Step 3: Cross multiply
    80,617.30x = 120,780.15 × 65,745.70
  4. Step 4: Simplify right side
    80,617.30x = 7,940,775,507.86
  5. Step 5: Solve for x
    x = 7,940,775,507.86/80,617.30
  6. Step 6: Final answer
    x = 98,499.65

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1.5x scale

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.