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Finding the Fourth Proportional to 27,129.60, 40,732.80 and 21,292.80

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Solution

The fourth proportional to 27,129.60, 40,732.80 and 21,292.80 is: 31,969.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,129.60 : 40,732.80 = 21,292.80 : x
  2. Step 2: Convert to fraction form
    27,129.60/40,732.80 = 21,292.80/x
  3. Step 3: Cross multiply
    27,129.60x = 40,732.80 × 21,292.80
  4. Step 4: Simplify right side
    27,129.60x = 867,315,363.84
  5. Step 5: Solve for x
    x = 867,315,363.84/27,129.60
  6. Step 6: Final answer
    x = 31,969.34

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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.