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Finding the Fourth Proportional to 76,842.96, 115,251.48 and 21,426

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Solution

The fourth proportional to 76,842.96, 115,251.48 and 21,426 is: 32,135.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,842.96 : 115,251.48 = 21,426 : x
  2. Step 2: Convert to fraction form
    76,842.96/115,251.48 = 21,426/x
  3. Step 3: Cross multiply
    76,842.96x = 115,251.48 × 21,426
  4. Step 4: Simplify right side
    76,842.96x = 2,469,378,210.48
  5. Step 5: Solve for x
    x = 2,469,378,210.48/76,842.96
  6. Step 6: Final answer
    x = 32,135.39

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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.