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Finding the Fourth Proportional to 18,982.70, 28,474.80 and 7,135.28

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Solution

The fourth proportional to 18,982.70, 28,474.80 and 7,135.28 is: 10,703.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,982.70 : 28,474.80 = 7,135.28 : x
  2. Step 2: Convert to fraction form
    18,982.70/28,474.80 = 7,135.28/x
  3. Step 3: Cross multiply
    18,982.70x = 28,474.80 × 7,135.28
  4. Step 4: Simplify right side
    18,982.70x = 203,175,670.94
  5. Step 5: Solve for x
    x = 203,175,670.94/18,982.70
  6. Step 6: Final answer
    x = 10,703.20

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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.