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Finding the Fourth Proportional to 258,959,796.80, 388,327,720.80 and 129,517,390.40

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Solution

The fourth proportional to 258,959,796.80, 388,327,720.80 and 129,517,390.40 is: 194,220,082.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,959,796.80 : 388,327,720.80 = 129,517,390.40 : x
  2. Step 2: Convert to fraction form
    258,959,796.80/388,327,720.80 = 129,517,390.40/x
  3. Step 3: Cross multiply
    258,959,796.80x = 388,327,720.80 × 129,517,390.40
  4. Step 4: Simplify right side
    258,959,796.80x = 50,295,193,017,995,808
  5. Step 5: Solve for x
    x = 50,295,193,017,995,808/258,959,796.80
  6. Step 6: Final answer
    x = 194,220,082.19

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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.