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Finding the Fourth Proportional to 80,180.90, 120,188.30 and 65,991.84

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Solution

The fourth proportional to 80,180.90, 120,188.30 and 65,991.84 is: 98,919.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,180.90 : 120,188.30 = 65,991.84 : x
  2. Step 2: Convert to fraction form
    80,180.90/120,188.30 = 65,991.84/x
  3. Step 3: Cross multiply
    80,180.90x = 120,188.30 × 65,991.84
  4. Step 4: Simplify right side
    80,180.90x = 7,931,447,555.42
  5. Step 5: Solve for x
    x = 7,931,447,555.42/80,180.90
  6. Step 6: Final answer
    x = 98,919.41

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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.