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Finding the Fourth Proportional to 259,939.22, 389,021.72 and 217,866.80

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Solution

The fourth proportional to 259,939.22, 389,021.72 and 217,866.80 is: 326,056.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,939.22 : 389,021.72 = 217,866.80 : x
  2. Step 2: Convert to fraction form
    259,939.22/389,021.72 = 217,866.80/x
  3. Step 3: Cross multiply
    259,939.22x = 389,021.72 × 217,866.80
  4. Step 4: Simplify right side
    259,939.22x = 84,754,917,266.90
  5. Step 5: Solve for x
    x = 84,754,917,266.90/259,939.22
  6. Step 6: Final answer
    x = 326,056.67

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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.