Home / 20,190,385.20-30,285,577.80-12,128,228.40

Finding the Fourth Proportional to 20,190,385.20, 30,285,577.80 and 12,128,228.40

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Solution

The fourth proportional to 20,190,385.20, 30,285,577.80 and 12,128,228.40 is: 18,192,342.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,190,385.20 : 30,285,577.80 = 12,128,228.40 : x
  2. Step 2: Convert to fraction form
    20,190,385.20/30,285,577.80 = 12,128,228.40/x
  3. Step 3: Cross multiply
    20,190,385.20x = 30,285,577.80 × 12,128,228.40
  4. Step 4: Simplify right side
    20,190,385.20x = 367,310,404,784,369.56
  5. Step 5: Solve for x
    x = 367,310,404,784,369.56/20,190,385.20
  6. Step 6: Final answer
    x = 18,192,342.60

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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.