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Finding the Fourth Proportional to 1,327.42, 1,990.56 and 668.89

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Solution

The fourth proportional to 1,327.42, 1,990.56 and 668.89 is: 1,003.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,327.42 : 1,990.56 = 668.89 : x
  2. Step 2: Convert to fraction form
    1,327.42/1,990.56 = 668.89/x
  3. Step 3: Cross multiply
    1,327.42x = 1,990.56 × 668.89
  4. Step 4: Simplify right side
    1,327.42x = 1,331,466.91
  5. Step 5: Solve for x
    x = 1,331,466.91/1,327.42
  6. Step 6: Final answer
    x = 1,003.05

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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.