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Finding the Fourth Proportional to 1,078.07, 1,616.68 and 639.44

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Solution

The fourth proportional to 1,078.07, 1,616.68 and 639.44 is: 958.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.07 : 1,616.68 = 639.44 : x
  2. Step 2: Convert to fraction form
    1,078.07/1,616.68 = 639.44/x
  3. Step 3: Cross multiply
    1,078.07x = 1,616.68 × 639.44
  4. Step 4: Simplify right side
    1,078.07x = 1,033,768.64
  5. Step 5: Solve for x
    x = 1,033,768.64/1,078.07
  6. Step 6: Final answer
    x = 958.91

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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.