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Finding the Fourth Proportional to 983.44, 1,356.51 and 721

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Solution

The fourth proportional to 983.44, 1,356.51 and 721 is: 994.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.44 : 1,356.51 = 721 : x
  2. Step 2: Convert to fraction form
    983.44/1,356.51 = 721/x
  3. Step 3: Cross multiply
    983.44x = 1,356.51 × 721
  4. Step 4: Simplify right side
    983.44x = 978,043.71
  5. Step 5: Solve for x
    x = 978,043.71/983.44
  6. Step 6: Final answer
    x = 994.51

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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.