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Finding the Fourth Proportional to 259,664.20, 389,457.90 and 72,694.60

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Solution

The fourth proportional to 259,664.20, 389,457.90 and 72,694.60 is: 109,031.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,664.20 : 389,457.90 = 72,694.60 : x
  2. Step 2: Convert to fraction form
    259,664.20/389,457.90 = 72,694.60/x
  3. Step 3: Cross multiply
    259,664.20x = 389,457.90 × 72,694.60
  4. Step 4: Simplify right side
    259,664.20x = 28,311,486,257.34
  5. Step 5: Solve for x
    x = 28,311,486,257.34/259,664.20
  6. Step 6: Final answer
    x = 109,031.15

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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.