Home / 21,933.78-30,266.37-12,979.56

Finding the Fourth Proportional to 21,933.78, 30,266.37 and 12,979.56

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Solution

The fourth proportional to 21,933.78, 30,266.37 and 12,979.56 is: 17,910.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,933.78 : 30,266.37 = 12,979.56 : x
  2. Step 2: Convert to fraction form
    21,933.78/30,266.37 = 12,979.56/x
  3. Step 3: Cross multiply
    21,933.78x = 30,266.37 × 12,979.56
  4. Step 4: Simplify right side
    21,933.78x = 392,844,165.40
  5. Step 5: Solve for x
    x = 392,844,165.40/21,933.78
  6. Step 6: Final answer
    x = 17,910.46

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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.