Home / 3,905.16-5,389.12-2,136.78

Finding the Fourth Proportional to 3,905.16, 5,389.12 and 2,136.78

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Solution

The fourth proportional to 3,905.16, 5,389.12 and 2,136.78 is: 2,948.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,905.16 : 5,389.12 = 2,136.78 : x
  2. Step 2: Convert to fraction form
    3,905.16/5,389.12 = 2,136.78/x
  3. Step 3: Cross multiply
    3,905.16x = 5,389.12 × 2,136.78
  4. Step 4: Simplify right side
    3,905.16x = 11,515,366.50
  5. Step 5: Solve for x
    x = 11,515,366.50/3,905.16
  6. Step 6: Final answer
    x = 2,948.76

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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.