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Finding the Fourth Proportional to 983.31, 1,356.96 and 541.21

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Solution

The fourth proportional to 983.31, 1,356.96 and 541.21 is: 746.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    983.31 : 1,356.96 = 541.21 : x
  2. Step 2: Convert to fraction form
    983.31/1,356.96 = 541.21/x
  3. Step 3: Cross multiply
    983.31x = 1,356.96 × 541.21
  4. Step 4: Simplify right side
    983.31x = 734,390.83
  5. Step 5: Solve for x
    x = 734,390.83/983.31
  6. Step 6: Final answer
    x = 746.85

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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.