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Finding the Fourth Proportional to 18,978.96, 28,457.46 and 7,872.96

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Solution

The fourth proportional to 18,978.96, 28,457.46 and 7,872.96 is: 11,804.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.96 : 28,457.46 = 7,872.96 : x
  2. Step 2: Convert to fraction form
    18,978.96/28,457.46 = 7,872.96/x
  3. Step 3: Cross multiply
    18,978.96x = 28,457.46 × 7,872.96
  4. Step 4: Simplify right side
    18,978.96x = 224,044,444.28
  5. Step 5: Solve for x
    x = 224,044,444.28/18,978.96
  6. Step 6: Final answer
    x = 11,804.89

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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.