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Finding the Fourth Proportional to 18,930.16, 28,388.76 and 7,246.72

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Solution

The fourth proportional to 18,930.16, 28,388.76 and 7,246.72 is: 10,867.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,930.16 : 28,388.76 = 7,246.72 : x
  2. Step 2: Convert to fraction form
    18,930.16/28,388.76 = 7,246.72/x
  3. Step 3: Cross multiply
    18,930.16x = 28,388.76 × 7,246.72
  4. Step 4: Simplify right side
    18,930.16x = 205,725,394.87
  5. Step 5: Solve for x
    x = 205,725,394.87/18,930.16
  6. Step 6: Final answer
    x = 10,867.60

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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.