Home / 80,997.20-121,406.70-28,379.60

Finding the Fourth Proportional to 80,997.20, 121,406.70 and 28,379.60

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Solution

The fourth proportional to 80,997.20, 121,406.70 and 28,379.60 is: 42,538.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,997.20 : 121,406.70 = 28,379.60 : x
  2. Step 2: Convert to fraction form
    80,997.20/121,406.70 = 28,379.60/x
  3. Step 3: Cross multiply
    80,997.20x = 121,406.70 × 28,379.60
  4. Step 4: Simplify right side
    80,997.20x = 3,445,473,583.32
  5. Step 5: Solve for x
    x = 3,445,473,583.32/80,997.20
  6. Step 6: Final answer
    x = 42,538.18

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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.