Home / 28,783.28-39,738.12-20,817.20

Finding the Fourth Proportional to 28,783.28, 39,738.12 and 20,817.20

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Solution

The fourth proportional to 28,783.28, 39,738.12 and 20,817.20 is: 28,740.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,783.28 : 39,738.12 = 20,817.20 : x
  2. Step 2: Convert to fraction form
    28,783.28/39,738.12 = 20,817.20/x
  3. Step 3: Cross multiply
    28,783.28x = 39,738.12 × 20,817.20
  4. Step 4: Simplify right side
    28,783.28x = 827,236,391.66
  5. Step 5: Solve for x
    x = 827,236,391.66/28,783.28
  6. Step 6: Final answer
    x = 28,740.17

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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.