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Finding the Fourth Proportional to 1,205.86, 1,664.63 and 708.53

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Solution

The fourth proportional to 1,205.86, 1,664.63 and 708.53 is: 978.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.86 : 1,664.63 = 708.53 : x
  2. Step 2: Convert to fraction form
    1,205.86/1,664.63 = 708.53/x
  3. Step 3: Cross multiply
    1,205.86x = 1,664.63 × 708.53
  4. Step 4: Simplify right side
    1,205.86x = 1,179,443.57
  5. Step 5: Solve for x
    x = 1,179,443.57/1,205.86
  6. Step 6: Final answer
    x = 978.09

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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.