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Finding the Fourth Proportional to 80,492.40, 120,738.60 and 72,975.60

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Solution

The fourth proportional to 80,492.40, 120,738.60 and 72,975.60 is: 109,463.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,492.40 : 120,738.60 = 72,975.60 : x
  2. Step 2: Convert to fraction form
    80,492.40/120,738.60 = 72,975.60/x
  3. Step 3: Cross multiply
    80,492.40x = 120,738.60 × 72,975.60
  4. Step 4: Simplify right side
    80,492.40x = 8,810,971,778.16
  5. Step 5: Solve for x
    x = 8,810,971,778.16/80,492.40
  6. Step 6: Final answer
    x = 109,463.40

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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.