Home / 21,620.69-29,836.50-12,189.18

Finding the Fourth Proportional to 21,620.69, 29,836.50 and 12,189.18

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Solution

The fourth proportional to 21,620.69, 29,836.50 and 12,189.18 is: 16,821.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,620.69 : 29,836.50 = 12,189.18 : x
  2. Step 2: Convert to fraction form
    21,620.69/29,836.50 = 12,189.18/x
  3. Step 3: Cross multiply
    21,620.69x = 29,836.50 × 12,189.18
  4. Step 4: Simplify right side
    21,620.69x = 363,682,603.81
  5. Step 5: Solve for x
    x = 363,682,603.81/21,620.69
  6. Step 6: Final answer
    x = 16,821.05

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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.