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Finding the Fourth Proportional to 1,990.64, 2,748.35 and 1,362.21

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Solution

The fourth proportional to 1,990.64, 2,748.35 and 1,362.21 is: 1,880.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.64 : 2,748.35 = 1,362.21 : x
  2. Step 2: Convert to fraction form
    1,990.64/2,748.35 = 1,362.21/x
  3. Step 3: Cross multiply
    1,990.64x = 2,748.35 × 1,362.21
  4. Step 4: Simplify right side
    1,990.64x = 3,743,823.04
  5. Step 5: Solve for x
    x = 3,743,823.04/1,990.64
  6. Step 6: Final answer
    x = 1,880.72

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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.