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Finding the Fourth Proportional to 18,456.79, 27,684.21 and 5,308.64

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Solution

The fourth proportional to 18,456.79, 27,684.21 and 5,308.64 is: 7,962.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,456.79 : 27,684.21 = 5,308.64 : x
  2. Step 2: Convert to fraction form
    18,456.79/27,684.21 = 5,308.64/x
  3. Step 3: Cross multiply
    18,456.79x = 27,684.21 × 5,308.64
  4. Step 4: Simplify right side
    18,456.79x = 146,965,593.69
  5. Step 5: Solve for x
    x = 146,965,593.69/18,456.79
  6. Step 6: Final answer
    x = 7,962.69

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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.