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Finding the Fourth Proportional to 1,789.78, 2,684.14 and 693.90

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Solution

The fourth proportional to 1,789.78, 2,684.14 and 693.90 is: 1,040.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,789.78 : 2,684.14 = 693.90 : x
  2. Step 2: Convert to fraction form
    1,789.78/2,684.14 = 693.90/x
  3. Step 3: Cross multiply
    1,789.78x = 2,684.14 × 693.90
  4. Step 4: Simplify right side
    1,789.78x = 1,862,524.75
  5. Step 5: Solve for x
    x = 1,862,524.75/1,789.78
  6. Step 6: Final answer
    x = 1,040.64

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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.