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Finding the Fourth Proportional to 660,993.92, 989,041.44 and 394,899.20

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Solution

The fourth proportional to 660,993.92, 989,041.44 and 394,899.20 is: 590,885.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,993.92 : 989,041.44 = 394,899.20 : x
  2. Step 2: Convert to fraction form
    660,993.92/989,041.44 = 394,899.20/x
  3. Step 3: Cross multiply
    660,993.92x = 989,041.44 × 394,899.20
  4. Step 4: Simplify right side
    660,993.92x = 390,571,673,422.85
  5. Step 5: Solve for x
    x = 390,571,673,422.85/660,993.92
  6. Step 6: Final answer
    x = 590,885.43

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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.