Home / 31,014.36-42,786-20,939.76

Finding the Fourth Proportional to 31,014.36, 42,786 and 20,939.76

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Solution

The fourth proportional to 31,014.36, 42,786 and 20,939.76 is: 28,887.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,014.36 : 42,786 = 20,939.76 : x
  2. Step 2: Convert to fraction form
    31,014.36/42,786 = 20,939.76/x
  3. Step 3: Cross multiply
    31,014.36x = 42,786 × 20,939.76
  4. Step 4: Simplify right side
    31,014.36x = 895,928,571.36
  5. Step 5: Solve for x
    x = 895,928,571.36/31,014.36
  6. Step 6: Final answer
    x = 28,887.54

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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.