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Finding the Fourth Proportional to 18,979.13, 28,486.05 and 9,625.60

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Solution

The fourth proportional to 18,979.13, 28,486.05 and 9,625.60 is: 14,447.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,979.13 : 28,486.05 = 9,625.60 : x
  2. Step 2: Convert to fraction form
    18,979.13/28,486.05 = 9,625.60/x
  3. Step 3: Cross multiply
    18,979.13x = 28,486.05 × 9,625.60
  4. Step 4: Simplify right side
    18,979.13x = 274,195,322.88
  5. Step 5: Solve for x
    x = 274,195,322.88/18,979.13
  6. Step 6: Final answer
    x = 14,447.21

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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.