Home / 20,478.16-28,259.58-11,986.12

Finding the Fourth Proportional to 20,478.16, 28,259.58 and 11,986.12

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Solution

The fourth proportional to 20,478.16, 28,259.58 and 11,986.12 is: 16,540.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,478.16 : 28,259.58 = 11,986.12 : x
  2. Step 2: Convert to fraction form
    20,478.16/28,259.58 = 11,986.12/x
  3. Step 3: Cross multiply
    20,478.16x = 28,259.58 × 11,986.12
  4. Step 4: Simplify right side
    20,478.16x = 338,722,717.03
  5. Step 5: Solve for x
    x = 338,722,717.03/20,478.16
  6. Step 6: Final answer
    x = 16,540.68

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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.