Home / 27,710.31-38,190.78-20,979.81

Finding the Fourth Proportional to 27,710.31, 38,190.78 and 20,979.81

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Solution

The fourth proportional to 27,710.31, 38,190.78 and 20,979.81 is: 28,914.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,710.31 : 38,190.78 = 20,979.81 : x
  2. Step 2: Convert to fraction form
    27,710.31/38,190.78 = 20,979.81/x
  3. Step 3: Cross multiply
    27,710.31x = 38,190.78 × 20,979.81
  4. Step 4: Simplify right side
    27,710.31x = 801,235,308.15
  5. Step 5: Solve for x
    x = 801,235,308.15/27,710.31
  6. Step 6: Final answer
    x = 28,914.70

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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.