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Finding the Fourth Proportional to 213,785.36, 320,733.38 and 80,666.78

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Solution

The fourth proportional to 213,785.36, 320,733.38 and 80,666.78 is: 121,021.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,785.36 : 320,733.38 = 80,666.78 : x
  2. Step 2: Convert to fraction form
    213,785.36/320,733.38 = 80,666.78/x
  3. Step 3: Cross multiply
    213,785.36x = 320,733.38 × 80,666.78
  4. Step 4: Simplify right side
    213,785.36x = 25,872,529,003.12
  5. Step 5: Solve for x
    x = 25,872,529,003.12/213,785.36
  6. Step 6: Final answer
    x = 121,021.05

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1.5x scale

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.