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Finding the Fourth Proportional to 1,990.98, 2,748.92 and 1,245.30

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Solution

The fourth proportional to 1,990.98, 2,748.92 and 1,245.30 is: 1,719.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.98 : 2,748.92 = 1,245.30 : x
  2. Step 2: Convert to fraction form
    1,990.98/2,748.92 = 1,245.30/x
  3. Step 3: Cross multiply
    1,990.98x = 2,748.92 × 1,245.30
  4. Step 4: Simplify right side
    1,990.98x = 3,423,230.08
  5. Step 5: Solve for x
    x = 3,423,230.08/1,990.98
  6. Step 6: Final answer
    x = 1,719.37

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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.