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Finding the Fourth Proportional to 323,643.60, 485,465.40 and 211,669.20

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Solution

The fourth proportional to 323,643.60, 485,465.40 and 211,669.20 is: 317,503.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    323,643.60 : 485,465.40 = 211,669.20 : x
  2. Step 2: Convert to fraction form
    323,643.60/485,465.40 = 211,669.20/x
  3. Step 3: Cross multiply
    323,643.60x = 485,465.40 × 211,669.20
  4. Step 4: Simplify right side
    323,643.60x = 102,758,072,845.68
  5. Step 5: Solve for x
    x = 102,758,072,845.68/323,643.60
  6. Step 6: Final answer
    x = 317,503.80

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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.