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Finding the Fourth Proportional to 18,715.68, 28,080 and 12,500.64

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Solution

The fourth proportional to 18,715.68, 28,080 and 12,500.64 is: 18,755.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,715.68 : 28,080 = 12,500.64 : x
  2. Step 2: Convert to fraction form
    18,715.68/28,080 = 12,500.64/x
  3. Step 3: Cross multiply
    18,715.68x = 28,080 × 12,500.64
  4. Step 4: Simplify right side
    18,715.68x = 351,017,971.20
  5. Step 5: Solve for x
    x = 351,017,971.20/18,715.68
  6. Step 6: Final answer
    x = 18,755.29

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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.