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Finding the Fourth Proportional to 139,621.60, 209,432.40 and 100,255.60

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Solution

The fourth proportional to 139,621.60, 209,432.40 and 100,255.60 is: 150,383.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,621.60 : 209,432.40 = 100,255.60 : x
  2. Step 2: Convert to fraction form
    139,621.60/209,432.40 = 100,255.60/x
  3. Step 3: Cross multiply
    139,621.60x = 209,432.40 × 100,255.60
  4. Step 4: Simplify right side
    139,621.60x = 20,996,770,921.44
  5. Step 5: Solve for x
    x = 20,996,770,921.44/139,621.60
  6. Step 6: Final answer
    x = 150,383.40

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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.