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Finding the Fourth Proportional to 3,779.40, 5,215.40 and 2,100.84

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Solution

The fourth proportional to 3,779.40, 5,215.40 and 2,100.84 is: 2,899.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,779.40 : 5,215.40 = 2,100.84 : x
  2. Step 2: Convert to fraction form
    3,779.40/5,215.40 = 2,100.84/x
  3. Step 3: Cross multiply
    3,779.40x = 5,215.40 × 2,100.84
  4. Step 4: Simplify right side
    3,779.40x = 10,956,720.94
  5. Step 5: Solve for x
    x = 10,956,720.94/3,779.40
  6. Step 6: Final answer
    x = 2,899.06

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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.