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Finding the Fourth Proportional to 18,708, 28,102.68 and 11,315.92

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Solution

The fourth proportional to 18,708, 28,102.68 and 11,315.92 is: 16,998.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,708 : 28,102.68 = 11,315.92 : x
  2. Step 2: Convert to fraction form
    18,708/28,102.68 = 11,315.92/x
  3. Step 3: Cross multiply
    18,708x = 28,102.68 × 11,315.92
  4. Step 4: Simplify right side
    18,708x = 318,007,678.67
  5. Step 5: Solve for x
    x = 318,007,678.67/18,708
  6. Step 6: Final answer
    x = 16,998.49

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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.