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Finding the Fourth Proportional to 1,235.63, 1,705.19 and 711.78

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Solution

The fourth proportional to 1,235.63, 1,705.19 and 711.78 is: 982.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.63 : 1,705.19 = 711.78 : x
  2. Step 2: Convert to fraction form
    1,235.63/1,705.19 = 711.78/x
  3. Step 3: Cross multiply
    1,235.63x = 1,705.19 × 711.78
  4. Step 4: Simplify right side
    1,235.63x = 1,213,716.58
  5. Step 5: Solve for x
    x = 1,213,716.58/1,235.63
  6. Step 6: Final answer
    x = 982.27

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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.