Home / 21,908.40-30,229.08-12,956.16

Finding the Fourth Proportional to 21,908.40, 30,229.08 and 12,956.16

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Solution

The fourth proportional to 21,908.40, 30,229.08 and 12,956.16 is: 17,876.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,908.40 : 30,229.08 = 12,956.16 : x
  2. Step 2: Convert to fraction form
    21,908.40/30,229.08 = 12,956.16/x
  3. Step 3: Cross multiply
    21,908.40x = 30,229.08 × 12,956.16
  4. Step 4: Simplify right side
    21,908.40x = 391,652,797.13
  5. Step 5: Solve for x
    x = 391,652,797.13/21,908.40
  6. Step 6: Final answer
    x = 17,876.83

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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.