Home / 20,857.40-28,783.80-12,680.99

Finding the Fourth Proportional to 20,857.40, 28,783.80 and 12,680.99

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Solution

The fourth proportional to 20,857.40, 28,783.80 and 12,680.99 is: 17,500.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,857.40 : 28,783.80 = 12,680.99 : x
  2. Step 2: Convert to fraction form
    20,857.40/28,783.80 = 12,680.99/x
  3. Step 3: Cross multiply
    20,857.40x = 28,783.80 × 12,680.99
  4. Step 4: Simplify right side
    20,857.40x = 365,007,079.96
  5. Step 5: Solve for x
    x = 365,007,079.96/20,857.40
  6. Step 6: Final answer
    x = 17,500.12

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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.