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Finding the Fourth Proportional to 520,137,992.80, 780,206,989.20 and 472,520,879.20

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Solution

The fourth proportional to 520,137,992.80, 780,206,989.20 and 472,520,879.20 is: 708,781,318.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,137,992.80 : 780,206,989.20 = 472,520,879.20 : x
  2. Step 2: Convert to fraction form
    520,137,992.80/780,206,989.20 = 472,520,879.20/x
  3. Step 3: Cross multiply
    520,137,992.80x = 780,206,989.20 × 472,520,879.20
  4. Step 4: Simplify right side
    520,137,992.80x = 368,664,092,494,768,896
  5. Step 5: Solve for x
    x = 368,664,092,494,768,896/520,137,992.80
  6. Step 6: Final answer
    x = 708,781,318.80

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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.