Home / 20,858.15-28,782.30-11,905.57

Finding the Fourth Proportional to 20,858.15, 28,782.30 and 11,905.57

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Solution

The fourth proportional to 20,858.15, 28,782.30 and 11,905.57 is: 16,428.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,858.15 : 28,782.30 = 11,905.57 : x
  2. Step 2: Convert to fraction form
    20,858.15/28,782.30 = 11,905.57/x
  3. Step 3: Cross multiply
    20,858.15x = 28,782.30 × 11,905.57
  4. Step 4: Simplify right side
    20,858.15x = 342,669,687.41
  5. Step 5: Solve for x
    x = 342,669,687.41/20,858.15
  6. Step 6: Final answer
    x = 16,428.58

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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.