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Finding the Fourth Proportional to 1,991.30, 2,748.30 and 1,433.61

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Solution

The fourth proportional to 1,991.30, 2,748.30 and 1,433.61 is: 1,978.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.30 : 2,748.30 = 1,433.61 : x
  2. Step 2: Convert to fraction form
    1,991.30/2,748.30 = 1,433.61/x
  3. Step 3: Cross multiply
    1,991.30x = 2,748.30 × 1,433.61
  4. Step 4: Simplify right side
    1,991.30x = 3,939,984.99
  5. Step 5: Solve for x
    x = 3,939,984.99/1,991.30
  6. Step 6: Final answer
    x = 1,978.60

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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.