Home / 1,091.14-1,636.80-311.15

Finding the Fourth Proportional to 1,091.14, 1,636.80 and 311.15

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Solution

The fourth proportional to 1,091.14, 1,636.80 and 311.15 is: 466.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.14 : 1,636.80 = 311.15 : x
  2. Step 2: Convert to fraction form
    1,091.14/1,636.80 = 311.15/x
  3. Step 3: Cross multiply
    1,091.14x = 1,636.80 × 311.15
  4. Step 4: Simplify right side
    1,091.14x = 509,290.32
  5. Step 5: Solve for x
    x = 509,290.32/1,091.14
  6. Step 6: Final answer
    x = 466.75

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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.