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Finding the Fourth Proportional to 1,206.41, 1,664.83 and 708.96

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Solution

The fourth proportional to 1,206.41, 1,664.83 and 708.96 is: 978.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.41 : 1,664.83 = 708.96 : x
  2. Step 2: Convert to fraction form
    1,206.41/1,664.83 = 708.96/x
  3. Step 3: Cross multiply
    1,206.41x = 1,664.83 × 708.96
  4. Step 4: Simplify right side
    1,206.41x = 1,180,297.88
  5. Step 5: Solve for x
    x = 1,180,297.88/1,206.41
  6. Step 6: Final answer
    x = 978.36

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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.