Home / 13,915.42-20,869.40-3,919.56

Finding the Fourth Proportional to 13,915.42, 20,869.40 and 3,919.56

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Solution

The fourth proportional to 13,915.42, 20,869.40 and 3,919.56 is: 5,878.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,915.42 : 20,869.40 = 3,919.56 : x
  2. Step 2: Convert to fraction form
    13,915.42/20,869.40 = 3,919.56/x
  3. Step 3: Cross multiply
    13,915.42x = 20,869.40 × 3,919.56
  4. Step 4: Simplify right side
    13,915.42x = 81,798,865.46
  5. Step 5: Solve for x
    x = 81,798,865.46/13,915.42
  6. Step 6: Final answer
    x = 5,878.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.