Home / 21,896.54-30,206.40-12,939.71

Finding the Fourth Proportional to 21,896.54, 30,206.40 and 12,939.71

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Solution

The fourth proportional to 21,896.54, 30,206.40 and 12,939.71 is: 17,850.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,896.54 : 30,206.40 = 12,939.71 : x
  2. Step 2: Convert to fraction form
    21,896.54/30,206.40 = 12,939.71/x
  3. Step 3: Cross multiply
    21,896.54x = 30,206.40 × 12,939.71
  4. Step 4: Simplify right side
    21,896.54x = 390,862,056.14
  5. Step 5: Solve for x
    x = 390,862,056.14/21,896.54
  6. Step 6: Final answer
    x = 17,850.40

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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.