Home / 39,720.21-54,813.81-21,815.37

Finding the Fourth Proportional to 39,720.21, 54,813.81 and 21,815.37

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Solution

The fourth proportional to 39,720.21, 54,813.81 and 21,815.37 is: 30,105.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,720.21 : 54,813.81 = 21,815.37 : x
  2. Step 2: Convert to fraction form
    39,720.21/54,813.81 = 21,815.37/x
  3. Step 3: Cross multiply
    39,720.21x = 54,813.81 × 21,815.37
  4. Step 4: Simplify right side
    39,720.21x = 1,195,783,546.26
  5. Step 5: Solve for x
    x = 1,195,783,546.26/39,720.21
  6. Step 6: Final answer
    x = 30,105.17

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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.