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Finding the Fourth Proportional to 1,205.90, 1,664.19 and 708.56

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Solution

The fourth proportional to 1,205.90, 1,664.19 and 708.56 is: 977.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.90 : 1,664.19 = 708.56 : x
  2. Step 2: Convert to fraction form
    1,205.90/1,664.19 = 708.56/x
  3. Step 3: Cross multiply
    1,205.90x = 1,664.19 × 708.56
  4. Step 4: Simplify right side
    1,205.90x = 1,179,178.47
  5. Step 5: Solve for x
    x = 1,179,178.47/1,205.90
  6. Step 6: Final answer
    x = 977.84

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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.