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Finding the Fourth Proportional to 18,956.70, 28,442.34 and 7,267.20

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Solution

The fourth proportional to 18,956.70, 28,442.34 and 7,267.20 is: 10,903.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,956.70 : 28,442.34 = 7,267.20 : x
  2. Step 2: Convert to fraction form
    18,956.70/28,442.34 = 7,267.20/x
  3. Step 3: Cross multiply
    18,956.70x = 28,442.34 × 7,267.20
  4. Step 4: Simplify right side
    18,956.70x = 206,696,173.25
  5. Step 5: Solve for x
    x = 206,696,173.25/18,956.70
  6. Step 6: Final answer
    x = 10,903.59

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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.