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Finding the Fourth Proportional to 2,166.50, 2,990.31 and 1,235.54

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Solution

The fourth proportional to 2,166.50, 2,990.31 and 1,235.54 is: 1,705.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,166.50 : 2,990.31 = 1,235.54 : x
  2. Step 2: Convert to fraction form
    2,166.50/2,990.31 = 1,235.54/x
  3. Step 3: Cross multiply
    2,166.50x = 2,990.31 × 1,235.54
  4. Step 4: Simplify right side
    2,166.50x = 3,694,647.62
  5. Step 5: Solve for x
    x = 3,694,647.62/2,166.50
  6. Step 6: Final answer
    x = 1,705.35

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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.