Home / 27,987.12-38,673.69-20,420.64

Finding the Fourth Proportional to 27,987.12, 38,673.69 and 20,420.64

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Solution

The fourth proportional to 27,987.12, 38,673.69 and 20,420.64 is: 28,218.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,987.12 : 38,673.69 = 20,420.64 : x
  2. Step 2: Convert to fraction form
    27,987.12/38,673.69 = 20,420.64/x
  3. Step 3: Cross multiply
    27,987.12x = 38,673.69 × 20,420.64
  4. Step 4: Simplify right side
    27,987.12x = 789,741,500.96
  5. Step 5: Solve for x
    x = 789,741,500.96/27,987.12
  6. Step 6: Final answer
    x = 28,218.03

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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.