Home / 20,906.05-31,386.90-12,147.25

Finding the Fourth Proportional to 20,906.05, 31,386.90 and 12,147.25

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Solution

The fourth proportional to 20,906.05, 31,386.90 and 12,147.25 is: 18,237.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,906.05 : 31,386.90 = 12,147.25 : x
  2. Step 2: Convert to fraction form
    20,906.05/31,386.90 = 12,147.25/x
  3. Step 3: Cross multiply
    20,906.05x = 31,386.90 × 12,147.25
  4. Step 4: Simplify right side
    20,906.05x = 381,264,521.03
  5. Step 5: Solve for x
    x = 381,264,521.03/20,906.05
  6. Step 6: Final answer
    x = 18,237.04

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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.