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Finding the Fourth Proportional to 3,899.30, 5,381.04 and 2,130.90

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Solution

The fourth proportional to 3,899.30, 5,381.04 and 2,130.90 is: 2,940.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,899.30 : 5,381.04 = 2,130.90 : x
  2. Step 2: Convert to fraction form
    3,899.30/5,381.04 = 2,130.90/x
  3. Step 3: Cross multiply
    3,899.30x = 5,381.04 × 2,130.90
  4. Step 4: Simplify right side
    3,899.30x = 11,466,458.14
  5. Step 5: Solve for x
    x = 11,466,458.14/3,899.30
  6. Step 6: Final answer
    x = 2,940.65

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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.