Home / 20,787.28-28,685.60-11,355.92

Finding the Fourth Proportional to 20,787.28, 28,685.60 and 11,355.92

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Solution

The fourth proportional to 20,787.28, 28,685.60 and 11,355.92 is: 15,670.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.28 : 28,685.60 = 11,355.92 : x
  2. Step 2: Convert to fraction form
    20,787.28/28,685.60 = 11,355.92/x
  3. Step 3: Cross multiply
    20,787.28x = 28,685.60 × 11,355.92
  4. Step 4: Simplify right side
    20,787.28x = 325,751,378.75
  5. Step 5: Solve for x
    x = 325,751,378.75/20,787.28
  6. Step 6: Final answer
    x = 15,670.71

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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.