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Finding the Fourth Proportional to 1,327.05, 1,990.44 and 402.57

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Solution

The fourth proportional to 1,327.05, 1,990.44 and 402.57 is: 603.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.05 : 1,990.44 = 402.57 : x
  2. Step 2: Convert to fraction form
    1,327.05/1,990.44 = 402.57/x
  3. Step 3: Cross multiply
    1,327.05x = 1,990.44 × 402.57
  4. Step 4: Simplify right side
    1,327.05x = 801,291.43
  5. Step 5: Solve for x
    x = 801,291.43/1,327.05
  6. Step 6: Final answer
    x = 603.81

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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.