Home / 686,479.56-1,028,556.80-415,789.78

Finding the Fourth Proportional to 686,479.56, 1,028,556.80 and 415,789.78

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Solution

The fourth proportional to 686,479.56, 1,028,556.80 and 415,789.78 is: 622,980.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,479.56 : 1,028,556.80 = 415,789.78 : x
  2. Step 2: Convert to fraction form
    686,479.56/1,028,556.80 = 415,789.78/x
  3. Step 3: Cross multiply
    686,479.56x = 1,028,556.80 × 415,789.78
  4. Step 4: Simplify right side
    686,479.56x = 427,663,404,057.59
  5. Step 5: Solve for x
    x = 427,663,404,057.59/686,479.56
  6. Step 6: Final answer
    x = 622,980.54

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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.