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Finding the Fourth Proportional to 1,395.90, 2,093.87 and 422.05

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Solution

The fourth proportional to 1,395.90, 2,093.87 and 422.05 is: 633.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.90 : 2,093.87 = 422.05 : x
  2. Step 2: Convert to fraction form
    1,395.90/2,093.87 = 422.05/x
  3. Step 3: Cross multiply
    1,395.90x = 2,093.87 × 422.05
  4. Step 4: Simplify right side
    1,395.90x = 883,717.83
  5. Step 5: Solve for x
    x = 883,717.83/1,395.90
  6. Step 6: Final answer
    x = 633.08

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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.