Home / 20,311.40-28,029.78-11,815.56

Finding the Fourth Proportional to 20,311.40, 28,029.78 and 11,815.56

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Solution

The fourth proportional to 20,311.40, 28,029.78 and 11,815.56 is: 16,305.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,311.40 : 28,029.78 = 11,815.56 : x
  2. Step 2: Convert to fraction form
    20,311.40/28,029.78 = 11,815.56/x
  3. Step 3: Cross multiply
    20,311.40x = 28,029.78 × 11,815.56
  4. Step 4: Simplify right side
    20,311.40x = 331,187,547.38
  5. Step 5: Solve for x
    x = 331,187,547.38/20,311.40
  6. Step 6: Final answer
    x = 16,305.50

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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.