Home / 20,930.88-28,885.23-11,981.25

Finding the Fourth Proportional to 20,930.88, 28,885.23 and 11,981.25

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Solution

The fourth proportional to 20,930.88, 28,885.23 and 11,981.25 is: 16,534.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,930.88 : 28,885.23 = 11,981.25 : x
  2. Step 2: Convert to fraction form
    20,930.88/28,885.23 = 11,981.25/x
  3. Step 3: Cross multiply
    20,930.88x = 28,885.23 × 11,981.25
  4. Step 4: Simplify right side
    20,930.88x = 346,081,161.94
  5. Step 5: Solve for x
    x = 346,081,161.94/20,930.88
  6. Step 6: Final answer
    x = 16,534.48

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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.