Home / 20,945.40-31,418.10-12,197.40

Finding the Fourth Proportional to 20,945.40, 31,418.10 and 12,197.40

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Solution

The fourth proportional to 20,945.40, 31,418.10 and 12,197.40 is: 18,296.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,945.40 : 31,418.10 = 12,197.40 : x
  2. Step 2: Convert to fraction form
    20,945.40/31,418.10 = 12,197.40/x
  3. Step 3: Cross multiply
    20,945.40x = 31,418.10 × 12,197.40
  4. Step 4: Simplify right side
    20,945.40x = 383,219,132.94
  5. Step 5: Solve for x
    x = 383,219,132.94/20,945.40
  6. Step 6: Final answer
    x = 18,296.10

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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.