Home / 21,920.88-30,250.76-12,489.51

Finding the Fourth Proportional to 21,920.88, 30,250.76 and 12,489.51

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Solution

The fourth proportional to 21,920.88, 30,250.76 and 12,489.51 is: 17,235.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,920.88 : 30,250.76 = 12,489.51 : x
  2. Step 2: Convert to fraction form
    21,920.88/30,250.76 = 12,489.51/x
  3. Step 3: Cross multiply
    21,920.88x = 30,250.76 × 12,489.51
  4. Step 4: Simplify right side
    21,920.88x = 377,817,107.08
  5. Step 5: Solve for x
    x = 377,817,107.08/21,920.88
  6. Step 6: Final answer
    x = 17,235.49

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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.