Home / 20,786.68-28,685.50-11,355.18

Finding the Fourth Proportional to 20,786.68, 28,685.50 and 11,355.18

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Solution

The fourth proportional to 20,786.68, 28,685.50 and 11,355.18 is: 15,670.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,786.68 : 28,685.50 = 11,355.18 : x
  2. Step 2: Convert to fraction form
    20,786.68/28,685.50 = 11,355.18/x
  3. Step 3: Cross multiply
    20,786.68x = 28,685.50 × 11,355.18
  4. Step 4: Simplify right side
    20,786.68x = 325,729,015.89
  5. Step 5: Solve for x
    x = 325,729,015.89/20,786.68
  6. Step 6: Final answer
    x = 15,670.08

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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.