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Finding the Fourth Proportional to 1,399.65, 2,099.78 and 425.82

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Solution

The fourth proportional to 1,399.65, 2,099.78 and 425.82 is: 638.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.65 : 2,099.78 = 425.82 : x
  2. Step 2: Convert to fraction form
    1,399.65/2,099.78 = 425.82/x
  3. Step 3: Cross multiply
    1,399.65x = 2,099.78 × 425.82
  4. Step 4: Simplify right side
    1,399.65x = 894,136.86
  5. Step 5: Solve for x
    x = 894,136.86/1,399.65
  6. Step 6: Final answer
    x = 638.83

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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.