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Finding the Fourth Proportional to 27,143.80, 40,629.30 and 19,367.80

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Solution

The fourth proportional to 27,143.80, 40,629.30 and 19,367.80 is: 28,990.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,143.80 : 40,629.30 = 19,367.80 : x
  2. Step 2: Convert to fraction form
    27,143.80/40,629.30 = 19,367.80/x
  3. Step 3: Cross multiply
    27,143.80x = 40,629.30 × 19,367.80
  4. Step 4: Simplify right side
    27,143.80x = 786,900,156.54
  5. Step 5: Solve for x
    x = 786,900,156.54/27,143.80
  6. Step 6: Final answer
    x = 28,990.05

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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.