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Finding the Fourth Proportional to 279,936,694.80, 420,114,994.20 and 143,551,875.60

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Solution

The fourth proportional to 279,936,694.80, 420,114,994.20 and 143,551,875.60 is: 215,435,477.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,936,694.80 : 420,114,994.20 = 143,551,875.60 : x
  2. Step 2: Convert to fraction form
    279,936,694.80/420,114,994.20 = 143,551,875.60/x
  3. Step 3: Cross multiply
    279,936,694.80x = 420,114,994.20 × 143,551,875.60
  4. Step 4: Simplify right side
    279,936,694.80x = 60,308,295,385,093,120
  5. Step 5: Solve for x
    x = 60,308,295,385,093,120/279,936,694.80
  6. Step 6: Final answer
    x = 215,435,477.04

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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.