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Finding the Fourth Proportional to 80,400.60, 120,600.90 and 57,072.60

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Solution

The fourth proportional to 80,400.60, 120,600.90 and 57,072.60 is: 85,608.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,400.60 : 120,600.90 = 57,072.60 : x
  2. Step 2: Convert to fraction form
    80,400.60/120,600.90 = 57,072.60/x
  3. Step 3: Cross multiply
    80,400.60x = 120,600.90 × 57,072.60
  4. Step 4: Simplify right side
    80,400.60x = 6,883,006,925.34
  5. Step 5: Solve for x
    x = 6,883,006,925.34/80,400.60
  6. Step 6: Final answer
    x = 85,608.90

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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.