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Finding the Fourth Proportional to 1,321.26, 1,981.91 and 499.31

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Solution

The fourth proportional to 1,321.26, 1,981.91 and 499.31 is: 748.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.26 : 1,981.91 = 499.31 : x
  2. Step 2: Convert to fraction form
    1,321.26/1,981.91 = 499.31/x
  3. Step 3: Cross multiply
    1,321.26x = 1,981.91 × 499.31
  4. Step 4: Simplify right side
    1,321.26x = 989,597.05
  5. Step 5: Solve for x
    x = 989,597.05/1,321.26
  6. Step 6: Final answer
    x = 748.98

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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.