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Finding the Fourth Proportional to 259,638.20, 389,457.30 and 170,991.80

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Solution

The fourth proportional to 259,638.20, 389,457.30 and 170,991.80 is: 256,487.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,638.20 : 389,457.30 = 170,991.80 : x
  2. Step 2: Convert to fraction form
    259,638.20/389,457.30 = 170,991.80/x
  3. Step 3: Cross multiply
    259,638.20x = 389,457.30 × 170,991.80
  4. Step 4: Simplify right side
    259,638.20x = 66,594,004,750.14
  5. Step 5: Solve for x
    x = 66,594,004,750.14/259,638.20
  6. Step 6: Final answer
    x = 256,487.70

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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.