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Finding the Fourth Proportional to 1,078.36, 1,619.60 and 670.35

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Solution

The fourth proportional to 1,078.36, 1,619.60 and 670.35 is: 1,006.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.36 : 1,619.60 = 670.35 : x
  2. Step 2: Convert to fraction form
    1,078.36/1,619.60 = 670.35/x
  3. Step 3: Cross multiply
    1,078.36x = 1,619.60 × 670.35
  4. Step 4: Simplify right side
    1,078.36x = 1,085,698.86
  5. Step 5: Solve for x
    x = 1,085,698.86/1,078.36
  6. Step 6: Final answer
    x = 1,006.81

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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.