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Finding the Fourth Proportional to 18,779.40, 28,169.10 and 18,664.20

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Solution

The fourth proportional to 18,779.40, 28,169.10 and 18,664.20 is: 27,996.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,779.40 : 28,169.10 = 18,664.20 : x
  2. Step 2: Convert to fraction form
    18,779.40/28,169.10 = 18,664.20/x
  3. Step 3: Cross multiply
    18,779.40x = 28,169.10 × 18,664.20
  4. Step 4: Simplify right side
    18,779.40x = 525,753,716.22
  5. Step 5: Solve for x
    x = 525,753,716.22/18,779.40
  6. Step 6: Final answer
    x = 27,996.30

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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.