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Finding the Fourth Proportional to 3,813.12, 5,715.54 and 1,620.54

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Solution

The fourth proportional to 3,813.12, 5,715.54 and 1,620.54 is: 2,429.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,813.12 : 5,715.54 = 1,620.54 : x
  2. Step 2: Convert to fraction form
    3,813.12/5,715.54 = 1,620.54/x
  3. Step 3: Cross multiply
    3,813.12x = 5,715.54 × 1,620.54
  4. Step 4: Simplify right side
    3,813.12x = 9,262,261.19
  5. Step 5: Solve for x
    x = 9,262,261.19/3,813.12
  6. Step 6: Final answer
    x = 2,429.05

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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.