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Finding the Fourth Proportional to 427,309,019.20, 640,963,528.80 and 279,355,844.80

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Solution

The fourth proportional to 427,309,019.20, 640,963,528.80 and 279,355,844.80 is: 419,033,767.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,309,019.20 : 640,963,528.80 = 279,355,844.80 : x
  2. Step 2: Convert to fraction form
    427,309,019.20/640,963,528.80 = 279,355,844.80/x
  3. Step 3: Cross multiply
    427,309,019.20x = 640,963,528.80 × 279,355,844.80
  4. Step 4: Simplify right side
    427,309,019.20x = 179,056,908,073,913,120
  5. Step 5: Solve for x
    x = 179,056,908,073,913,120/427,309,019.20
  6. Step 6: Final answer
    x = 419,033,767.20

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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.