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Finding the Fourth Proportional to 40,911.20, 61,330.80 and 27,720.80

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Solution

The fourth proportional to 40,911.20, 61,330.80 and 27,720.80 is: 41,556.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,911.20 : 61,330.80 = 27,720.80 : x
  2. Step 2: Convert to fraction form
    40,911.20/61,330.80 = 27,720.80/x
  3. Step 3: Cross multiply
    40,911.20x = 61,330.80 × 27,720.80
  4. Step 4: Simplify right side
    40,911.20x = 1,700,138,840.64
  5. Step 5: Solve for x
    x = 1,700,138,840.64/40,911.20
  6. Step 6: Final answer
    x = 41,556.81

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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.