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Finding the Fourth Proportional to 1,399.86, 2,099.79 and 425.97

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Solution

The fourth proportional to 1,399.86, 2,099.79 and 425.97 is: 638.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.86 : 2,099.79 = 425.97 : x
  2. Step 2: Convert to fraction form
    1,399.86/2,099.79 = 425.97/x
  3. Step 3: Cross multiply
    1,399.86x = 2,099.79 × 425.97
  4. Step 4: Simplify right side
    1,399.86x = 894,447.55
  5. Step 5: Solve for x
    x = 894,447.55/1,399.86
  6. Step 6: Final answer
    x = 638.96

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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.