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Finding the Fourth Proportional to 1,990.71, 2,748.87 and 1,887.51

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Solution

The fourth proportional to 1,990.71, 2,748.87 and 1,887.51 is: 2,606.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.71 : 2,748.87 = 1,887.51 : x
  2. Step 2: Convert to fraction form
    1,990.71/2,748.87 = 1,887.51/x
  3. Step 3: Cross multiply
    1,990.71x = 2,748.87 × 1,887.51
  4. Step 4: Simplify right side
    1,990.71x = 5,188,519.61
  5. Step 5: Solve for x
    x = 5,188,519.61/1,990.71
  6. Step 6: Final answer
    x = 2,606.37

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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.