Home / 419,905,389.60-629,858,084.40-128,817,439.20

Finding the Fourth Proportional to 419,905,389.60, 629,858,084.40 and 128,817,439.20

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Solution

The fourth proportional to 419,905,389.60, 629,858,084.40 and 128,817,439.20 is: 193,226,158.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    419,905,389.60 : 629,858,084.40 = 128,817,439.20 : x
  2. Step 2: Convert to fraction form
    419,905,389.60/629,858,084.40 = 128,817,439.20/x
  3. Step 3: Cross multiply
    419,905,389.60x = 629,858,084.40 × 128,817,439.20
  4. Step 4: Simplify right side
    419,905,389.60x = 81,136,705,491,825,472
  5. Step 5: Solve for x
    x = 81,136,705,491,825,472/419,905,389.60
  6. Step 6: Final answer
    x = 193,226,158.80

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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.