Home / 20,971.89-31,442.58-9,872.42

Finding the Fourth Proportional to 20,971.89, 31,442.58 and 9,872.42

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Solution

The fourth proportional to 20,971.89, 31,442.58 and 9,872.42 is: 14,801.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.89 : 31,442.58 = 9,872.42 : x
  2. Step 2: Convert to fraction form
    20,971.89/31,442.58 = 9,872.42/x
  3. Step 3: Cross multiply
    20,971.89x = 31,442.58 × 9,872.42
  4. Step 4: Simplify right side
    20,971.89x = 310,414,198.43
  5. Step 5: Solve for x
    x = 310,414,198.43/20,971.89
  6. Step 6: Final answer
    x = 14,801.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.