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Finding the Fourth Proportional to 1,812.71, 2,714.33 and 989.28

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Solution

The fourth proportional to 1,812.71, 2,714.33 and 989.28 is: 1,481.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,812.71 : 2,714.33 = 989.28 : x
  2. Step 2: Convert to fraction form
    1,812.71/2,714.33 = 989.28/x
  3. Step 3: Cross multiply
    1,812.71x = 2,714.33 × 989.28
  4. Step 4: Simplify right side
    1,812.71x = 2,685,220.97
  5. Step 5: Solve for x
    x = 2,685,220.97/1,812.71
  6. Step 6: Final answer
    x = 1,481.33

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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.