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Finding the Fourth Proportional to 1,321.93, 1,982.91 and 541.38

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Solution

The fourth proportional to 1,321.93, 1,982.91 and 541.38 is: 812.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.93 : 1,982.91 = 541.38 : x
  2. Step 2: Convert to fraction form
    1,321.93/1,982.91 = 541.38/x
  3. Step 3: Cross multiply
    1,321.93x = 1,982.91 × 541.38
  4. Step 4: Simplify right side
    1,321.93x = 1,073,512.71
  5. Step 5: Solve for x
    x = 1,073,512.71/1,321.93
  6. Step 6: Final answer
    x = 812.08

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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.