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Finding the Fourth Proportional to 3,913.62, 5,400.84 and 2,145.42

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Solution

The fourth proportional to 3,913.62, 5,400.84 and 2,145.42 is: 2,960.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,913.62 : 5,400.84 = 2,145.42 : x
  2. Step 2: Convert to fraction form
    3,913.62/5,400.84 = 2,145.42/x
  3. Step 3: Cross multiply
    3,913.62x = 5,400.84 × 2,145.42
  4. Step 4: Simplify right side
    3,913.62x = 11,587,070.15
  5. Step 5: Solve for x
    x = 11,587,070.15/3,913.62
  6. Step 6: Final answer
    x = 2,960.70

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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.