Home / 39,720.80-54,814.73-21,816.69

Finding the Fourth Proportional to 39,720.80, 54,814.73 and 21,816.69

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Solution

The fourth proportional to 39,720.80, 54,814.73 and 21,816.69 is: 30,107.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,720.80 : 54,814.73 = 21,816.69 : x
  2. Step 2: Convert to fraction form
    39,720.80/54,814.73 = 21,816.69/x
  3. Step 3: Cross multiply
    39,720.80x = 54,814.73 × 21,816.69
  4. Step 4: Simplify right side
    39,720.80x = 1,195,875,862.76
  5. Step 5: Solve for x
    x = 1,195,875,862.76/39,720.80
  6. Step 6: Final answer
    x = 30,107.05

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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.