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Finding the Fourth Proportional to 99,643,591.80, 149,489,007.30 and 51,128,933.40

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Solution

The fourth proportional to 99,643,591.80, 149,489,007.30 and 51,128,933.40 is: 76,705,519.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,643,591.80 : 149,489,007.30 = 51,128,933.40 : x
  2. Step 2: Convert to fraction form
    99,643,591.80/149,489,007.30 = 51,128,933.40/x
  3. Step 3: Cross multiply
    99,643,591.80x = 149,489,007.30 × 51,128,933.40
  4. Step 4: Simplify right side
    99,643,591.80x = 7,643,213,498,273,814
  5. Step 5: Solve for x
    x = 7,643,213,498,273,814/99,643,591.80
  6. Step 6: Final answer
    x = 76,705,519.74

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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.