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Finding the Fourth Proportional to 12,876.92, 17,771.28 and 7,211.58

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Solution

The fourth proportional to 12,876.92, 17,771.28 and 7,211.58 is: 9,952.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,876.92 : 17,771.28 = 7,211.58 : x
  2. Step 2: Convert to fraction form
    12,876.92/17,771.28 = 7,211.58/x
  3. Step 3: Cross multiply
    12,876.92x = 17,771.28 × 7,211.58
  4. Step 4: Simplify right side
    12,876.92x = 128,158,900.54
  5. Step 5: Solve for x
    x = 128,158,900.54/12,876.92
  6. Step 6: Final answer
    x = 9,952.61

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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.