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Finding the Fourth Proportional to 2,111.44, 3,167.70 and 813.12

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Solution

The fourth proportional to 2,111.44, 3,167.70 and 813.12 is: 1,219.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,111.44 : 3,167.70 = 813.12 : x
  2. Step 2: Convert to fraction form
    2,111.44/3,167.70 = 813.12/x
  3. Step 3: Cross multiply
    2,111.44x = 3,167.70 × 813.12
  4. Step 4: Simplify right side
    2,111.44x = 2,575,720.22
  5. Step 5: Solve for x
    x = 2,575,720.22/2,111.44
  6. Step 6: Final answer
    x = 1,219.89

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1.5x scale

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.