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Finding the Fourth Proportional to 661,589,920.80, 990,873,226.80 and 389,492,128.80

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Solution

The fourth proportional to 661,589,920.80, 990,873,226.80 and 389,492,128.80 is: 583,348,249.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,589,920.80 : 990,873,226.80 = 389,492,128.80 : x
  2. Step 2: Convert to fraction form
    661,589,920.80/990,873,226.80 = 389,492,128.80/x
  3. Step 3: Cross multiply
    661,589,920.80x = 990,873,226.80 × 389,492,128.80
  4. Step 4: Simplify right side
    661,589,920.80x = 385,937,322,477,257,216
  5. Step 5: Solve for x
    x = 385,937,322,477,257,216/661,589,920.80
  6. Step 6: Final answer
    x = 583,348,249.94

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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.