Home / 20,812.81-28,731.04-13,269.25

Finding the Fourth Proportional to 20,812.81, 28,731.04 and 13,269.25

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Solution

The fourth proportional to 20,812.81, 28,731.04 and 13,269.25 is: 18,317.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,812.81 : 28,731.04 = 13,269.25 : x
  2. Step 2: Convert to fraction form
    20,812.81/28,731.04 = 13,269.25/x
  3. Step 3: Cross multiply
    20,812.81x = 28,731.04 × 13,269.25
  4. Step 4: Simplify right side
    20,812.81x = 381,239,286.17
  5. Step 5: Solve for x
    x = 381,239,286.17/20,812.81
  6. Step 6: Final answer
    x = 18,317.54

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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.