Home / 20,851.88-28,776.06-11,899.20

Finding the Fourth Proportional to 20,851.88, 28,776.06 and 11,899.20

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Solution

The fourth proportional to 20,851.88, 28,776.06 and 11,899.20 is: 16,421.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,851.88 : 28,776.06 = 11,899.20 : x
  2. Step 2: Convert to fraction form
    20,851.88/28,776.06 = 11,899.20/x
  3. Step 3: Cross multiply
    20,851.88x = 28,776.06 × 11,899.20
  4. Step 4: Simplify right side
    20,851.88x = 342,412,201.06
  5. Step 5: Solve for x
    x = 342,412,201.06/20,851.88
  6. Step 6: Final answer
    x = 16,421.17

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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.