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Finding the Fourth Proportional to 911.80, 1,367.70 and 854.20

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Solution

The fourth proportional to 911.80, 1,367.70 and 854.20 is: 1,281.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.80 : 1,367.70 = 854.20 : x
  2. Step 2: Convert to fraction form
    911.80/1,367.70 = 854.20/x
  3. Step 3: Cross multiply
    911.80x = 1,367.70 × 854.20
  4. Step 4: Simplify right side
    911.80x = 1,168,289.34
  5. Step 5: Solve for x
    x = 1,168,289.34/911.80
  6. Step 6: Final answer
    x = 1,281.30

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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.