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Finding the Fourth Proportional to 18,828.81, 28,210.82 and 13,272.21

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Solution

The fourth proportional to 18,828.81, 28,210.82 and 13,272.21 is: 19,885.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,828.81 : 28,210.82 = 13,272.21 : x
  2. Step 2: Convert to fraction form
    18,828.81/28,210.82 = 13,272.21/x
  3. Step 3: Cross multiply
    18,828.81x = 28,210.82 × 13,272.21
  4. Step 4: Simplify right side
    18,828.81x = 374,419,860.95
  5. Step 5: Solve for x
    x = 374,419,860.95/18,828.81
  6. Step 6: Final answer
    x = 19,885.48

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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.