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Finding the Fourth Proportional to 18,858.33, 28,120.90 and 18,689.44

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Solution

The fourth proportional to 18,858.33, 28,120.90 and 18,689.44 is: 27,869.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,858.33 : 28,120.90 = 18,689.44 : x
  2. Step 2: Convert to fraction form
    18,858.33/28,120.90 = 18,689.44/x
  3. Step 3: Cross multiply
    18,858.33x = 28,120.90 × 18,689.44
  4. Step 4: Simplify right side
    18,858.33x = 525,563,873.30
  5. Step 5: Solve for x
    x = 525,563,873.30/18,858.33
  6. Step 6: Final answer
    x = 27,869.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.