Home / 20,872.69-28,804.41-12,489.19

Finding the Fourth Proportional to 20,872.69, 28,804.41 and 12,489.19

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Solution

The fourth proportional to 20,872.69, 28,804.41 and 12,489.19 is: 17,235.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.69 : 28,804.41 = 12,489.19 : x
  2. Step 2: Convert to fraction form
    20,872.69/28,804.41 = 12,489.19/x
  3. Step 3: Cross multiply
    20,872.69x = 28,804.41 × 12,489.19
  4. Step 4: Simplify right side
    20,872.69x = 359,743,677.32
  5. Step 5: Solve for x
    x = 359,743,677.32/20,872.69
  6. Step 6: Final answer
    x = 17,235.14

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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.