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Finding the Fourth Proportional to 1,789.58, 2,469.36 and 992.78

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Solution

The fourth proportional to 1,789.58, 2,469.36 and 992.78 is: 1,369.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,789.58 : 2,469.36 = 992.78 : x
  2. Step 2: Convert to fraction form
    1,789.58/2,469.36 = 992.78/x
  3. Step 3: Cross multiply
    1,789.58x = 2,469.36 × 992.78
  4. Step 4: Simplify right side
    1,789.58x = 2,451,518.87
  5. Step 5: Solve for x
    x = 2,451,518.87/1,789.58
  6. Step 6: Final answer
    x = 1,369.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.