Home / 39,720.52-54,813.96-21,815.80

Finding the Fourth Proportional to 39,720.52, 54,813.96 and 21,815.80

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Solution

The fourth proportional to 39,720.52, 54,813.96 and 21,815.80 is: 30,105.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,720.52 : 54,813.96 = 21,815.80 : x
  2. Step 2: Convert to fraction form
    39,720.52/54,813.96 = 21,815.80/x
  3. Step 3: Cross multiply
    39,720.52x = 54,813.96 × 21,815.80
  4. Step 4: Simplify right side
    39,720.52x = 1,195,810,388.57
  5. Step 5: Solve for x
    x = 1,195,810,388.57/39,720.52
  6. Step 6: Final answer
    x = 30,105.61

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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.