Home / 18,979.80-26,202.78-11,428.20

Finding the Fourth Proportional to 18,979.80, 26,202.78 and 11,428.20

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Solution

The fourth proportional to 18,979.80, 26,202.78 and 11,428.20 is: 15,777.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979.80 : 26,202.78 = 11,428.20 : x
  2. Step 2: Convert to fraction form
    18,979.80/26,202.78 = 11,428.20/x
  3. Step 3: Cross multiply
    18,979.80x = 26,202.78 × 11,428.20
  4. Step 4: Simplify right side
    18,979.80x = 299,450,610.40
  5. Step 5: Solve for x
    x = 299,450,610.40/18,979.80
  6. Step 6: Final answer
    x = 15,777.33

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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.