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Finding the Fourth Proportional to 399,640.70, 551,497.64 and 218,348.73

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Solution

The fourth proportional to 399,640.70, 551,497.64 and 218,348.73 is: 301,317.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,640.70 : 551,497.64 = 218,348.73 : x
  2. Step 2: Convert to fraction form
    399,640.70/551,497.64 = 218,348.73/x
  3. Step 3: Cross multiply
    399,640.70x = 551,497.64 × 218,348.73
  4. Step 4: Simplify right side
    399,640.70x = 120,418,809,292.00
  5. Step 5: Solve for x
    x = 120,418,809,292.00/399,640.70
  6. Step 6: Final answer
    x = 301,317.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.