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Finding the Fourth Proportional to 1,373.96, 2,060.43 and 399.80

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Solution

The fourth proportional to 1,373.96, 2,060.43 and 399.80 is: 599.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,373.96 : 2,060.43 = 399.80 : x
  2. Step 2: Convert to fraction form
    1,373.96/2,060.43 = 399.80/x
  3. Step 3: Cross multiply
    1,373.96x = 2,060.43 × 399.80
  4. Step 4: Simplify right side
    1,373.96x = 823,759.91
  5. Step 5: Solve for x
    x = 823,759.91/1,373.96
  6. Step 6: Final answer
    x = 599.55

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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.