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Finding the Fourth Proportional to 1,186.80, 1,780.20 and 321.11

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Solution

The fourth proportional to 1,186.80, 1,780.20 and 321.11 is: 481.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.80 : 1,780.20 = 321.11 : x
  2. Step 2: Convert to fraction form
    1,186.80/1,780.20 = 321.11/x
  3. Step 3: Cross multiply
    1,186.80x = 1,780.20 × 321.11
  4. Step 4: Simplify right side
    1,186.80x = 571,640.02
  5. Step 5: Solve for x
    x = 571,640.02/1,186.80
  6. Step 6: Final answer
    x = 481.67

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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.