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Finding the Fourth Proportional to 1,321.55, 1,981.73 and 499.24

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Solution

The fourth proportional to 1,321.55, 1,981.73 and 499.24 is: 748.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.55 : 1,981.73 = 499.24 : x
  2. Step 2: Convert to fraction form
    1,321.55/1,981.73 = 499.24/x
  3. Step 3: Cross multiply
    1,321.55x = 1,981.73 × 499.24
  4. Step 4: Simplify right side
    1,321.55x = 989,358.89
  5. Step 5: Solve for x
    x = 989,358.89/1,321.55
  6. Step 6: Final answer
    x = 748.64

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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.