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Finding the Fourth Proportional to 213,783.36, 320,730.38 and 80,664.78

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Solution

The fourth proportional to 213,783.36, 320,730.38 and 80,664.78 is: 121,018.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,783.36 : 320,730.38 = 80,664.78 : x
  2. Step 2: Convert to fraction form
    213,783.36/320,730.38 = 80,664.78/x
  3. Step 3: Cross multiply
    213,783.36x = 320,730.38 × 80,664.78
  4. Step 4: Simplify right side
    213,783.36x = 25,871,645,542.02
  5. Step 5: Solve for x
    x = 25,871,645,542.02/213,783.36
  6. Step 6: Final answer
    x = 121,018.05

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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.