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Finding the Fourth Proportional to 3,959.60, 5,939.40 and 3,921.20

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Solution

The fourth proportional to 3,959.60, 5,939.40 and 3,921.20 is: 5,881.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,959.60 : 5,939.40 = 3,921.20 : x
  2. Step 2: Convert to fraction form
    3,959.60/5,939.40 = 3,921.20/x
  3. Step 3: Cross multiply
    3,959.60x = 5,939.40 × 3,921.20
  4. Step 4: Simplify right side
    3,959.60x = 23,289,575.28
  5. Step 5: Solve for x
    x = 23,289,575.28/3,959.60
  6. Step 6: Final answer
    x = 5,881.80

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1.5x scale

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.