Home / 20,890.80-31,346.42-10,361.81

Finding the Fourth Proportional to 20,890.80, 31,346.42 and 10,361.81

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Solution

The fourth proportional to 20,890.80, 31,346.42 and 10,361.81 is: 15,547.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.80 : 31,346.42 = 10,361.81 : x
  2. Step 2: Convert to fraction form
    20,890.80/31,346.42 = 10,361.81/x
  3. Step 3: Cross multiply
    20,890.80x = 31,346.42 × 10,361.81
  4. Step 4: Simplify right side
    20,890.80x = 324,805,439.68
  5. Step 5: Solve for x
    x = 324,805,439.68/20,890.80
  6. Step 6: Final answer
    x = 15,547.77

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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.