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Finding the Fourth Proportional to 1,311.39, 1,811.03 and 1,110.38

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Solution

The fourth proportional to 1,311.39, 1,811.03 and 1,110.38 is: 1,533.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.39 : 1,811.03 = 1,110.38 : x
  2. Step 2: Convert to fraction form
    1,311.39/1,811.03 = 1,110.38/x
  3. Step 3: Cross multiply
    1,311.39x = 1,811.03 × 1,110.38
  4. Step 4: Simplify right side
    1,311.39x = 2,010,916.88
  5. Step 5: Solve for x
    x = 2,010,916.88/1,311.39
  6. Step 6: Final answer
    x = 1,533.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.