Home / 20,720.93-28,594.86-11,289.50

Finding the Fourth Proportional to 20,720.93, 28,594.86 and 11,289.50

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Solution

The fourth proportional to 20,720.93, 28,594.86 and 11,289.50 is: 15,579.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.93 : 28,594.86 = 11,289.50 : x
  2. Step 2: Convert to fraction form
    20,720.93/28,594.86 = 11,289.50/x
  3. Step 3: Cross multiply
    20,720.93x = 28,594.86 × 11,289.50
  4. Step 4: Simplify right side
    20,720.93x = 322,821,529.00
  5. Step 5: Solve for x
    x = 322,821,529.00/20,720.93
  6. Step 6: Final answer
    x = 15,579.49

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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.