Home / 21,720.80-32,581.20-10,629.20

Finding the Fourth Proportional to 21,720.80, 32,581.20 and 10,629.20

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Solution

The fourth proportional to 21,720.80, 32,581.20 and 10,629.20 is: 15,943.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,720.80 : 32,581.20 = 10,629.20 : x
  2. Step 2: Convert to fraction form
    21,720.80/32,581.20 = 10,629.20/x
  3. Step 3: Cross multiply
    21,720.80x = 32,581.20 × 10,629.20
  4. Step 4: Simplify right side
    21,720.80x = 346,312,091.04
  5. Step 5: Solve for x
    x = 346,312,091.04/21,720.80
  6. Step 6: Final answer
    x = 15,943.80

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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.