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Finding the Fourth Proportional to 1,321.12, 1,982.03 and 499.63

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Solution

The fourth proportional to 1,321.12, 1,982.03 and 499.63 is: 749.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.12 : 1,982.03 = 499.63 : x
  2. Step 2: Convert to fraction form
    1,321.12/1,982.03 = 499.63/x
  3. Step 3: Cross multiply
    1,321.12x = 1,982.03 × 499.63
  4. Step 4: Simplify right side
    1,321.12x = 990,281.65
  5. Step 5: Solve for x
    x = 990,281.65/1,321.12
  6. Step 6: Final answer
    x = 749.58

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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.