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Finding the Fourth Proportional to 18,827.40, 28,245.57 and 5,679.90

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Solution

The fourth proportional to 18,827.40, 28,245.57 and 5,679.90 is: 8,521.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,827.40 : 28,245.57 = 5,679.90 : x
  2. Step 2: Convert to fraction form
    18,827.40/28,245.57 = 5,679.90/x
  3. Step 3: Cross multiply
    18,827.40x = 28,245.57 × 5,679.90
  4. Step 4: Simplify right side
    18,827.40x = 160,432,013.04
  5. Step 5: Solve for x
    x = 160,432,013.04/18,827.40
  6. Step 6: Final answer
    x = 8,521.20

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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.