Home / 20,869.48-28,805.22-12,907

Finding the Fourth Proportional to 20,869.48, 28,805.22 and 12,907

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Solution

The fourth proportional to 20,869.48, 28,805.22 and 12,907 is: 17,814.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,869.48 : 28,805.22 = 12,907 : x
  2. Step 2: Convert to fraction form
    20,869.48/28,805.22 = 12,907/x
  3. Step 3: Cross multiply
    20,869.48x = 28,805.22 × 12,907
  4. Step 4: Simplify right side
    20,869.48x = 371,788,974.54
  5. Step 5: Solve for x
    x = 371,788,974.54/20,869.48
  6. Step 6: Final answer
    x = 17,814.96

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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.