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Finding the Fourth Proportional to 873.99, 1,311.05 and 669.80

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Solution

The fourth proportional to 873.99, 1,311.05 and 669.80 is: 1,004.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.99 : 1,311.05 = 669.80 : x
  2. Step 2: Convert to fraction form
    873.99/1,311.05 = 669.80/x
  3. Step 3: Cross multiply
    873.99x = 1,311.05 × 669.80
  4. Step 4: Simplify right side
    873.99x = 878,146.24
  5. Step 5: Solve for x
    x = 878,146.24/873.99
  6. Step 6: Final answer
    x = 1,004.76

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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.