Home / 20,783.28-28,680.08-11,351.90

Finding the Fourth Proportional to 20,783.28, 28,680.08 and 11,351.90

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Solution

The fourth proportional to 20,783.28, 28,680.08 and 11,351.90 is: 15,665.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,783.28 : 28,680.08 = 11,351.90 : x
  2. Step 2: Convert to fraction form
    20,783.28/28,680.08 = 11,351.90/x
  3. Step 3: Cross multiply
    20,783.28x = 28,680.08 × 11,351.90
  4. Step 4: Simplify right side
    20,783.28x = 325,573,400.15
  5. Step 5: Solve for x
    x = 325,573,400.15/20,783.28
  6. Step 6: Final answer
    x = 15,665.16

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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.