Home / 419,904,687.20-629,857,030.80-128,769,497.60

Finding the Fourth Proportional to 419,904,687.20, 629,857,030.80 and 128,769,497.60

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Solution

The fourth proportional to 419,904,687.20, 629,857,030.80 and 128,769,497.60 is: 193,154,246.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    419,904,687.20 : 629,857,030.80 = 128,769,497.60 : x
  2. Step 2: Convert to fraction form
    419,904,687.20/629,857,030.80 = 128,769,497.60/x
  3. Step 3: Cross multiply
    419,904,687.20x = 629,857,030.80 × 128,769,497.60
  4. Step 4: Simplify right side
    419,904,687.20x = 81,106,373,415,943,712
  5. Step 5: Solve for x
    x = 81,106,373,415,943,712/419,904,687.20
  6. Step 6: Final answer
    x = 193,154,246.40

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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.