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Finding the Fourth Proportional to 2,091.98, 3,137.99 and 631.19

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Solution

The fourth proportional to 2,091.98, 3,137.99 and 631.19 is: 946.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,091.98 : 3,137.99 = 631.19 : x
  2. Step 2: Convert to fraction form
    2,091.98/3,137.99 = 631.19/x
  3. Step 3: Cross multiply
    2,091.98x = 3,137.99 × 631.19
  4. Step 4: Simplify right side
    2,091.98x = 1,980,676.15
  5. Step 5: Solve for x
    x = 1,980,676.15/2,091.98
  6. Step 6: Final answer
    x = 946.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.