Home / 27,991.30-38,630.72-20,905.42

Finding the Fourth Proportional to 27,991.30, 38,630.72 and 20,905.42

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Solution

The fourth proportional to 27,991.30, 38,630.72 and 20,905.42 is: 28,851.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,991.30 : 38,630.72 = 20,905.42 : x
  2. Step 2: Convert to fraction form
    27,991.30/38,630.72 = 20,905.42/x
  3. Step 3: Cross multiply
    27,991.30x = 38,630.72 × 20,905.42
  4. Step 4: Simplify right side
    27,991.30x = 807,591,128.82
  5. Step 5: Solve for x
    x = 807,591,128.82/27,991.30
  6. Step 6: Final answer
    x = 28,851.51

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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.