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Finding the Fourth Proportional to 18,940.64, 28,428.48 and 9,587.28

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Solution

The fourth proportional to 18,940.64, 28,428.48 and 9,587.28 is: 14,389.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,940.64 : 28,428.48 = 9,587.28 : x
  2. Step 2: Convert to fraction form
    18,940.64/28,428.48 = 9,587.28/x
  3. Step 3: Cross multiply
    18,940.64x = 28,428.48 × 9,587.28
  4. Step 4: Simplify right side
    18,940.64x = 272,551,797.73
  5. Step 5: Solve for x
    x = 272,551,797.73/18,940.64
  6. Step 6: Final answer
    x = 14,389.79

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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.