Home / 3,905.15-5,389.22-2,136.76

Finding the Fourth Proportional to 3,905.15, 5,389.22 and 2,136.76

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Solution

The fourth proportional to 3,905.15, 5,389.22 and 2,136.76 is: 2,948.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,905.15 : 5,389.22 = 2,136.76 : x
  2. Step 2: Convert to fraction form
    3,905.15/5,389.22 = 2,136.76/x
  3. Step 3: Cross multiply
    3,905.15x = 5,389.22 × 2,136.76
  4. Step 4: Simplify right side
    3,905.15x = 11,515,461.60
  5. Step 5: Solve for x
    x = 11,515,461.60/3,905.15
  6. Step 6: Final answer
    x = 2,948.79

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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.