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Finding the Fourth Proportional to 1,399.72, 2,099.82 and 425.80

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Solution

The fourth proportional to 1,399.72, 2,099.82 and 425.80 is: 638.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.72 : 2,099.82 = 425.80 : x
  2. Step 2: Convert to fraction form
    1,399.72/2,099.82 = 425.80/x
  3. Step 3: Cross multiply
    1,399.72x = 2,099.82 × 425.80
  4. Step 4: Simplify right side
    1,399.72x = 894,103.36
  5. Step 5: Solve for x
    x = 894,103.36/1,399.72
  6. Step 6: Final answer
    x = 638.77

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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.