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Finding the Fourth Proportional to 1,396.39, 2,094.90 and 422.47

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Solution

The fourth proportional to 1,396.39, 2,094.90 and 422.47 is: 633.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,396.39 : 2,094.90 = 422.47 : x
  2. Step 2: Convert to fraction form
    1,396.39/2,094.90 = 422.47/x
  3. Step 3: Cross multiply
    1,396.39x = 2,094.90 × 422.47
  4. Step 4: Simplify right side
    1,396.39x = 885,032.40
  5. Step 5: Solve for x
    x = 885,032.40/1,396.39
  6. Step 6: Final answer
    x = 633.80

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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.