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Finding the Fourth Proportional to 120,055.20, 180,520.20 and 100,809.60

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Solution

The fourth proportional to 120,055.20, 180,520.20 and 100,809.60 is: 151,581.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,055.20 : 180,520.20 = 100,809.60 : x
  2. Step 2: Convert to fraction form
    120,055.20/180,520.20 = 100,809.60/x
  3. Step 3: Cross multiply
    120,055.20x = 180,520.20 × 100,809.60
  4. Step 4: Simplify right side
    120,055.20x = 18,198,169,153.92
  5. Step 5: Solve for x
    x = 18,198,169,153.92/120,055.20
  6. Step 6: Final answer
    x = 151,581.68

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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.