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Finding the Fourth Proportional to 660,415.80, 988,655.40 and 394,039.20

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Solution

The fourth proportional to 660,415.80, 988,655.40 and 394,039.20 is: 589,884.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,415.80 : 988,655.40 = 394,039.20 : x
  2. Step 2: Convert to fraction form
    660,415.80/988,655.40 = 394,039.20/x
  3. Step 3: Cross multiply
    660,415.80x = 988,655.40 × 394,039.20
  4. Step 4: Simplify right side
    660,415.80x = 389,568,982,891.68
  5. Step 5: Solve for x
    x = 389,568,982,891.68/660,415.80
  6. Step 6: Final answer
    x = 589,884.41

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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.