Home / 28,428.22-39,209.79-20,872.18

Finding the Fourth Proportional to 28,428.22, 39,209.79 and 20,872.18

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Solution

The fourth proportional to 28,428.22, 39,209.79 and 20,872.18 is: 28,788.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,428.22 : 39,209.79 = 20,872.18 : x
  2. Step 2: Convert to fraction form
    28,428.22/39,209.79 = 20,872.18/x
  3. Step 3: Cross multiply
    28,428.22x = 39,209.79 × 20,872.18
  4. Step 4: Simplify right side
    28,428.22x = 818,393,794.64
  5. Step 5: Solve for x
    x = 818,393,794.64/28,428.22
  6. Step 6: Final answer
    x = 28,788.08

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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.