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Finding the Fourth Proportional to 1,472.12, 2,031.30 and 851

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Solution

The fourth proportional to 1,472.12, 2,031.30 and 851 is: 1,174.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,472.12 : 2,031.30 = 851 : x
  2. Step 2: Convert to fraction form
    1,472.12/2,031.30 = 851/x
  3. Step 3: Cross multiply
    1,472.12x = 2,031.30 × 851
  4. Step 4: Simplify right side
    1,472.12x = 1,728,636.30
  5. Step 5: Solve for x
    x = 1,728,636.30/1,472.12
  6. Step 6: Final answer
    x = 1,174.25

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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.