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Finding the Fourth Proportional to 1,954.43, 2,929.88 and 721

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Solution

The fourth proportional to 1,954.43, 2,929.88 and 721 is: 1,080.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,954.43 : 2,929.88 = 721 : x
  2. Step 2: Convert to fraction form
    1,954.43/2,929.88 = 721/x
  3. Step 3: Cross multiply
    1,954.43x = 2,929.88 × 721
  4. Step 4: Simplify right side
    1,954.43x = 2,112,443.48
  5. Step 5: Solve for x
    x = 2,112,443.48/1,954.43
  6. Step 6: Final answer
    x = 1,080.85

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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.