Home / 1,078.41-1,619.06-640.47

Finding the Fourth Proportional to 1,078.41, 1,619.06 and 640.47

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Solution

The fourth proportional to 1,078.41, 1,619.06 and 640.47 is: 961.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.41 : 1,619.06 = 640.47 : x
  2. Step 2: Convert to fraction form
    1,078.41/1,619.06 = 640.47/x
  3. Step 3: Cross multiply
    1,078.41x = 1,619.06 × 640.47
  4. Step 4: Simplify right side
    1,078.41x = 1,036,956.16
  5. Step 5: Solve for x
    x = 1,036,956.16/1,078.41
  6. Step 6: Final answer
    x = 961.56

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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.