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Finding the Fourth Proportional to 2,144.88, 3,215.70 and 845.64

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Solution

The fourth proportional to 2,144.88, 3,215.70 and 845.64 is: 1,267.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,144.88 : 3,215.70 = 845.64 : x
  2. Step 2: Convert to fraction form
    2,144.88/3,215.70 = 845.64/x
  3. Step 3: Cross multiply
    2,144.88x = 3,215.70 × 845.64
  4. Step 4: Simplify right side
    2,144.88x = 2,719,324.55
  5. Step 5: Solve for x
    x = 2,719,324.55/2,144.88
  6. Step 6: Final answer
    x = 1,267.82

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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.