Home / 21,920.19-30,249.87-12,488.75

Finding the Fourth Proportional to 21,920.19, 30,249.87 and 12,488.75

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Solution

The fourth proportional to 21,920.19, 30,249.87 and 12,488.75 is: 17,234.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,920.19 : 30,249.87 = 12,488.75 : x
  2. Step 2: Convert to fraction form
    21,920.19/30,249.87 = 12,488.75/x
  3. Step 3: Cross multiply
    21,920.19x = 30,249.87 × 12,488.75
  4. Step 4: Simplify right side
    21,920.19x = 377,783,001.52
  5. Step 5: Solve for x
    x = 377,783,001.52/21,920.19
  6. Step 6: Final answer
    x = 17,234.48

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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.