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Finding the Fourth Proportional to 1,393.78, 2,091.07 and 662.35

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Solution

The fourth proportional to 1,393.78, 2,091.07 and 662.35 is: 993.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.78 : 2,091.07 = 662.35 : x
  2. Step 2: Convert to fraction form
    1,393.78/2,091.07 = 662.35/x
  3. Step 3: Cross multiply
    1,393.78x = 2,091.07 × 662.35
  4. Step 4: Simplify right side
    1,393.78x = 1,385,020.21
  5. Step 5: Solve for x
    x = 1,385,020.21/1,393.78
  6. Step 6: Final answer
    x = 993.72

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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.