Home / 20,720.58-28,593.99-11,289.21

Finding the Fourth Proportional to 20,720.58, 28,593.99 and 11,289.21

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Solution

The fourth proportional to 20,720.58, 28,593.99 and 11,289.21 is: 15,578.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.58 : 28,593.99 = 11,289.21 : x
  2. Step 2: Convert to fraction form
    20,720.58/28,593.99 = 11,289.21/x
  3. Step 3: Cross multiply
    20,720.58x = 28,593.99 × 11,289.21
  4. Step 4: Simplify right side
    20,720.58x = 322,803,557.85
  5. Step 5: Solve for x
    x = 322,803,557.85/20,720.58
  6. Step 6: Final answer
    x = 15,578.89

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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.