Home / 3,899.50-5,381.08-2,130.76

Finding the Fourth Proportional to 3,899.50, 5,381.08 and 2,130.76

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Solution

The fourth proportional to 3,899.50, 5,381.08 and 2,130.76 is: 2,940.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,899.50 : 5,381.08 = 2,130.76 : x
  2. Step 2: Convert to fraction form
    3,899.50/5,381.08 = 2,130.76/x
  3. Step 3: Cross multiply
    3,899.50x = 5,381.08 × 2,130.76
  4. Step 4: Simplify right side
    3,899.50x = 11,465,790.02
  5. Step 5: Solve for x
    x = 11,465,790.02/3,899.50
  6. Step 6: Final answer
    x = 2,940.32

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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.