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Finding the Fourth Proportional to 472,405,840.80, 708,608,761.20 and 407,782,615.20

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Solution

The fourth proportional to 472,405,840.80, 708,608,761.20 and 407,782,615.20 is: 611,673,922.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    472,405,840.80 : 708,608,761.20 = 407,782,615.20 : x
  2. Step 2: Convert to fraction form
    472,405,840.80/708,608,761.20 = 407,782,615.20/x
  3. Step 3: Cross multiply
    472,405,840.80x = 708,608,761.20 × 407,782,615.20
  4. Step 4: Simplify right side
    472,405,840.80x = 288,958,333,795,768,320
  5. Step 5: Solve for x
    x = 288,958,333,795,768,320/472,405,840.80
  6. Step 6: Final answer
    x = 611,673,922.80

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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.