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Finding the Fourth Proportional to 2,147.42, 3,222.48 and 687.66

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Solution

The fourth proportional to 2,147.42, 3,222.48 and 687.66 is: 1,031.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,147.42 : 3,222.48 = 687.66 : x
  2. Step 2: Convert to fraction form
    2,147.42/3,222.48 = 687.66/x
  3. Step 3: Cross multiply
    2,147.42x = 3,222.48 × 687.66
  4. Step 4: Simplify right side
    2,147.42x = 2,215,970.60
  5. Step 5: Solve for x
    x = 2,215,970.60/2,147.42
  6. Step 6: Final answer
    x = 1,031.92

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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.