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Finding the Fourth Proportional to 18,989.02, 28,490.88 and 7,892.86

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Solution

The fourth proportional to 18,989.02, 28,490.88 and 7,892.86 is: 11,842.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.02 : 28,490.88 = 7,892.86 : x
  2. Step 2: Convert to fraction form
    18,989.02/28,490.88 = 7,892.86/x
  3. Step 3: Cross multiply
    18,989.02x = 28,490.88 × 7,892.86
  4. Step 4: Simplify right side
    18,989.02x = 224,874,527.12
  5. Step 5: Solve for x
    x = 224,874,527.12/18,989.02
  6. Step 6: Final answer
    x = 11,842.35

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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.