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Finding the Fourth Proportional to 2,813.05, 4,219.53 and 865.21

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Solution

The fourth proportional to 2,813.05, 4,219.53 and 865.21 is: 1,297.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,813.05 : 4,219.53 = 865.21 : x
  2. Step 2: Convert to fraction form
    2,813.05/4,219.53 = 865.21/x
  3. Step 3: Cross multiply
    2,813.05x = 4,219.53 × 865.21
  4. Step 4: Simplify right side
    2,813.05x = 3,650,779.55
  5. Step 5: Solve for x
    x = 3,650,779.55/2,813.05
  6. Step 6: Final answer
    x = 1,297.80

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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.