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Finding the Fourth Proportional to 1,318,863,003.20, 1,978,581,439.20 and 398,715,315.20

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Solution

The fourth proportional to 1,318,863,003.20, 1,978,581,439.20 and 398,715,315.20 is: 598,159,718.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318,863,003.20 : 1,978,581,439.20 = 398,715,315.20 : x
  2. Step 2: Convert to fraction form
    1,318,863,003.20/1,978,581,439.20 = 398,715,315.20/x
  3. Step 3: Cross multiply
    1,318,863,003.20x = 1,978,581,439.20 × 398,715,315.20
  4. Step 4: Simplify right side
    1,318,863,003.20x = 788,890,722,179,497,600
  5. Step 5: Solve for x
    x = 788,890,722,179,497,600/1,318,863,003.20
  6. Step 6: Final answer
    x = 598,159,718.08

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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.