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Finding the Fourth Proportional to 1,399.68, 2,099.61 and 425.79

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Solution

The fourth proportional to 1,399.68, 2,099.61 and 425.79 is: 638.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.68 : 2,099.61 = 425.79 : x
  2. Step 2: Convert to fraction form
    1,399.68/2,099.61 = 425.79/x
  3. Step 3: Cross multiply
    1,399.68x = 2,099.61 × 425.79
  4. Step 4: Simplify right side
    1,399.68x = 893,992.94
  5. Step 5: Solve for x
    x = 893,992.94/1,399.68
  6. Step 6: Final answer
    x = 638.71

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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.