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Finding the Fourth Proportional to 80,646,656.80, 120,969,985.20 and 80,646,656.80

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Solution

The fourth proportional to 80,646,656.80, 120,969,985.20 and 80,646,656.80 is: 120,969,985.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,646,656.80 : 120,969,985.20 = 80,646,656.80 : x
  2. Step 2: Convert to fraction form
    80,646,656.80/120,969,985.20 = 80,646,656.80/x
  3. Step 3: Cross multiply
    80,646,656.80x = 120,969,985.20 × 80,646,656.80
  4. Step 4: Simplify right side
    80,646,656.80x = 9,755,824,879,525,480
  5. Step 5: Solve for x
    x = 9,755,824,879,525,480/80,646,656.80
  6. Step 6: Final answer
    x = 120,969,985.20

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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.