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Finding the Fourth Proportional to 28,205.40, 42,338.88 and 20,786.88

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Solution

The fourth proportional to 28,205.40, 42,338.88 and 20,786.88 is: 31,203.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,205.40 : 42,338.88 = 20,786.88 : x
  2. Step 2: Convert to fraction form
    28,205.40/42,338.88 = 20,786.88/x
  3. Step 3: Cross multiply
    28,205.40x = 42,338.88 × 20,786.88
  4. Step 4: Simplify right side
    28,205.40x = 880,093,217.89
  5. Step 5: Solve for x
    x = 880,093,217.89/28,205.40
  6. Step 6: Final answer
    x = 31,203.00

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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.