Home / 3,905.40-5,389.38-2,136.97

Finding the Fourth Proportional to 3,905.40, 5,389.38 and 2,136.97

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Solution

The fourth proportional to 3,905.40, 5,389.38 and 2,136.97 is: 2,948.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,905.40 : 5,389.38 = 2,136.97 : x
  2. Step 2: Convert to fraction form
    3,905.40/5,389.38 = 2,136.97/x
  3. Step 3: Cross multiply
    3,905.40x = 5,389.38 × 2,136.97
  4. Step 4: Simplify right side
    3,905.40x = 11,516,943.38
  5. Step 5: Solve for x
    x = 11,516,943.38/3,905.40
  6. Step 6: Final answer
    x = 2,948.98

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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.