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Finding the Fourth Proportional to 80,485,128.40, 120,727,692.60 and 80,485,128.40

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Solution

The fourth proportional to 80,485,128.40, 120,727,692.60 and 80,485,128.40 is: 120,727,692.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,485,128.40 : 120,727,692.60 = 80,485,128.40 : x
  2. Step 2: Convert to fraction form
    80,485,128.40/120,727,692.60 = 80,485,128.40/x
  3. Step 3: Cross multiply
    80,485,128.40x = 120,727,692.60 × 80,485,128.40
  4. Step 4: Simplify right side
    80,485,128.40x = 9,716,783,840,346,730
  5. Step 5: Solve for x
    x = 9,716,783,840,346,730/80,485,128.40
  6. Step 6: Final answer
    x = 120,727,692.60

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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.