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Finding the Fourth Proportional to 323,721.60, 485,582.40 and 211,747.20

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Solution

The fourth proportional to 323,721.60, 485,582.40 and 211,747.20 is: 317,620.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    323,721.60 : 485,582.40 = 211,747.20 : x
  2. Step 2: Convert to fraction form
    323,721.60/485,582.40 = 211,747.20/x
  3. Step 3: Cross multiply
    323,721.60x = 485,582.40 × 211,747.20
  4. Step 4: Simplify right side
    323,721.60x = 102,820,713,569.28
  5. Step 5: Solve for x
    x = 102,820,713,569.28/323,721.60
  6. Step 6: Final answer
    x = 317,620.80

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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.