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Finding the Fourth Proportional to 323,619.80, 485,429.70 and 211,645.40

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Solution

The fourth proportional to 323,619.80, 485,429.70 and 211,645.40 is: 317,468.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    323,619.80 : 485,429.70 = 211,645.40 : x
  2. Step 2: Convert to fraction form
    323,619.80/485,429.70 = 211,645.40/x
  3. Step 3: Cross multiply
    323,619.80x = 485,429.70 × 211,645.40
  4. Step 4: Simplify right side
    323,619.80x = 102,738,963,028.38
  5. Step 5: Solve for x
    x = 102,738,963,028.38/323,619.80
  6. Step 6: Final answer
    x = 317,468.10

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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.