Home / 20,918.78-28,869.46-12,962.56

Finding the Fourth Proportional to 20,918.78, 28,869.46 and 12,962.56

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Solution

The fourth proportional to 20,918.78, 28,869.46 and 12,962.56 is: 17,889.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.78 : 28,869.46 = 12,962.56 : x
  2. Step 2: Convert to fraction form
    20,918.78/28,869.46 = 12,962.56/x
  3. Step 3: Cross multiply
    20,918.78x = 28,869.46 × 12,962.56
  4. Step 4: Simplify right side
    20,918.78x = 374,222,107.42
  5. Step 5: Solve for x
    x = 374,222,107.42/20,918.78
  6. Step 6: Final answer
    x = 17,889.29

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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.