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Finding the Fourth Proportional to 1,080.57, 1,620.85 and 311.07

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Solution

The fourth proportional to 1,080.57, 1,620.85 and 311.07 is: 466.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.57 : 1,620.85 = 311.07 : x
  2. Step 2: Convert to fraction form
    1,080.57/1,620.85 = 311.07/x
  3. Step 3: Cross multiply
    1,080.57x = 1,620.85 × 311.07
  4. Step 4: Simplify right side
    1,080.57x = 504,197.81
  5. Step 5: Solve for x
    x = 504,197.81/1,080.57
  6. Step 6: Final answer
    x = 466.60

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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.