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Finding the Fourth Proportional to 1,399.73, 2,099.71 and 425.84

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Solution

The fourth proportional to 1,399.73, 2,099.71 and 425.84 is: 638.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.73 : 2,099.71 = 425.84 : x
  2. Step 2: Convert to fraction form
    1,399.73/2,099.71 = 425.84/x
  3. Step 3: Cross multiply
    1,399.73x = 2,099.71 × 425.84
  4. Step 4: Simplify right side
    1,399.73x = 894,127.88
  5. Step 5: Solve for x
    x = 894,127.88/1,399.73
  6. Step 6: Final answer
    x = 638.79

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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.