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Finding the Fourth Proportional to 1,235.78, 1,705.35 and 711.92

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Solution

The fourth proportional to 1,235.78, 1,705.35 and 711.92 is: 982.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.78 : 1,705.35 = 711.92 : x
  2. Step 2: Convert to fraction form
    1,235.78/1,705.35 = 711.92/x
  3. Step 3: Cross multiply
    1,235.78x = 1,705.35 × 711.92
  4. Step 4: Simplify right side
    1,235.78x = 1,214,072.77
  5. Step 5: Solve for x
    x = 1,214,072.77/1,235.78
  6. Step 6: Final answer
    x = 982.43

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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.