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Finding the Fourth Proportional to 3,937.60, 5,906.40 and 3,860.80

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Solution

The fourth proportional to 3,937.60, 5,906.40 and 3,860.80 is: 5,791.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,937.60 : 5,906.40 = 3,860.80 : x
  2. Step 2: Convert to fraction form
    3,937.60/5,906.40 = 3,860.80/x
  3. Step 3: Cross multiply
    3,937.60x = 5,906.40 × 3,860.80
  4. Step 4: Simplify right side
    3,937.60x = 22,803,429.12
  5. Step 5: Solve for x
    x = 22,803,429.12/3,937.60
  6. Step 6: Final answer
    x = 5,791.20

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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.