Home / 13,916.81-20,869.75-5,145.73

Finding the Fourth Proportional to 13,916.81, 20,869.75 and 5,145.73

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Solution

The fourth proportional to 13,916.81, 20,869.75 and 5,145.73 is: 7,716.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,916.81 : 20,869.75 = 5,145.73 : x
  2. Step 2: Convert to fraction form
    13,916.81/20,869.75 = 5,145.73/x
  3. Step 3: Cross multiply
    13,916.81x = 20,869.75 × 5,145.73
  4. Step 4: Simplify right side
    13,916.81x = 107,390,052.93
  5. Step 5: Solve for x
    x = 107,390,052.93/13,916.81
  6. Step 6: Final answer
    x = 7,716.57

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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.