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Finding the Fourth Proportional to 428,652,220.80, 642,978,331.20 and 155,987,558.40

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Solution

The fourth proportional to 428,652,220.80, 642,978,331.20 and 155,987,558.40 is: 233,981,337.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,652,220.80 : 642,978,331.20 = 155,987,558.40 : x
  2. Step 2: Convert to fraction form
    428,652,220.80/642,978,331.20 = 155,987,558.40/x
  3. Step 3: Cross multiply
    428,652,220.80x = 642,978,331.20 × 155,987,558.40
  4. Step 4: Simplify right side
    428,652,220.80x = 100,296,619,987,994,560
  5. Step 5: Solve for x
    x = 100,296,619,987,994,560/428,652,220.80
  6. Step 6: Final answer
    x = 233,981,337.60

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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.