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Finding the Fourth Proportional to 3,915.12, 5,399.12 and 2,655.84

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Solution

The fourth proportional to 3,915.12, 5,399.12 and 2,655.84 is: 3,662.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,915.12 : 5,399.12 = 2,655.84 : x
  2. Step 2: Convert to fraction form
    3,915.12/5,399.12 = 2,655.84/x
  3. Step 3: Cross multiply
    3,915.12x = 5,399.12 × 2,655.84
  4. Step 4: Simplify right side
    3,915.12x = 14,339,198.86
  5. Step 5: Solve for x
    x = 14,339,198.86/3,915.12
  6. Step 6: Final answer
    x = 3,662.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.