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Finding the Fourth Proportional to 1,321.57, 1,982.28 and 499.83

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Solution

The fourth proportional to 1,321.57, 1,982.28 and 499.83 is: 749.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.57 : 1,982.28 = 499.83 : x
  2. Step 2: Convert to fraction form
    1,321.57/1,982.28 = 499.83/x
  3. Step 3: Cross multiply
    1,321.57x = 1,982.28 × 499.83
  4. Step 4: Simplify right side
    1,321.57x = 990,800.51
  5. Step 5: Solve for x
    x = 990,800.51/1,321.57
  6. Step 6: Final answer
    x = 749.71

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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.