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Finding the Fourth Proportional to 3,840.60, 5,760.90 and 3,135.90

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Solution

The fourth proportional to 3,840.60, 5,760.90 and 3,135.90 is: 4,703.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,840.60 : 5,760.90 = 3,135.90 : x
  2. Step 2: Convert to fraction form
    3,840.60/5,760.90 = 3,135.90/x
  3. Step 3: Cross multiply
    3,840.60x = 5,760.90 × 3,135.90
  4. Step 4: Simplify right side
    3,840.60x = 18,065,606.31
  5. Step 5: Solve for x
    x = 18,065,606.31/3,840.60
  6. Step 6: Final answer
    x = 4,703.85

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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.