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Finding the Fourth Proportional to 1,220.54, 1,695.70 and 1,205.96

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Solution

The fourth proportional to 1,220.54, 1,695.70 and 1,205.96 is: 1,675.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.54 : 1,695.70 = 1,205.96 : x
  2. Step 2: Convert to fraction form
    1,220.54/1,695.70 = 1,205.96/x
  3. Step 3: Cross multiply
    1,220.54x = 1,695.70 × 1,205.96
  4. Step 4: Simplify right side
    1,220.54x = 2,044,946.37
  5. Step 5: Solve for x
    x = 2,044,946.37/1,220.54
  6. Step 6: Final answer
    x = 1,675.44

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.