Home / 21,939.50-30,281.38-15,143.06

Finding the Fourth Proportional to 21,939.50, 30,281.38 and 15,143.06

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Solution

The fourth proportional to 21,939.50, 30,281.38 and 15,143.06 is: 20,900.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,939.50 : 30,281.38 = 15,143.06 : x
  2. Step 2: Convert to fraction form
    21,939.50/30,281.38 = 15,143.06/x
  3. Step 3: Cross multiply
    21,939.50x = 30,281.38 × 15,143.06
  4. Step 4: Simplify right side
    21,939.50x = 458,552,754.22
  5. Step 5: Solve for x
    x = 458,552,754.22/21,939.50
  6. Step 6: Final answer
    x = 20,900.78

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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.