Home / 20,720.87-28,594.79-11,289.42

Finding the Fourth Proportional to 20,720.87, 28,594.79 and 11,289.42

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Solution

The fourth proportional to 20,720.87, 28,594.79 and 11,289.42 is: 15,579.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.87 : 28,594.79 = 11,289.42 : x
  2. Step 2: Convert to fraction form
    20,720.87/28,594.79 = 11,289.42/x
  3. Step 3: Cross multiply
    20,720.87x = 28,594.79 × 11,289.42
  4. Step 4: Simplify right side
    20,720.87x = 322,818,537.67
  5. Step 5: Solve for x
    x = 322,818,537.67/20,720.87
  6. Step 6: Final answer
    x = 15,579.39

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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.