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Finding the Fourth Proportional to 258,990,652.80, 388,374,004.80 and 129,548,246.40

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Solution

The fourth proportional to 258,990,652.80, 388,374,004.80 and 129,548,246.40 is: 194,266,359.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,990,652.80 : 388,374,004.80 = 129,548,246.40 : x
  2. Step 2: Convert to fraction form
    258,990,652.80/388,374,004.80 = 129,548,246.40/x
  3. Step 3: Cross multiply
    258,990,652.80x = 388,374,004.80 × 129,548,246.40
  4. Step 4: Simplify right side
    258,990,652.80x = 50,313,171,269,185,184
  5. Step 5: Solve for x
    x = 50,313,171,269,185,184/258,990,652.80
  6. Step 6: Final answer
    x = 194,266,359.52

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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.