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Finding the Fourth Proportional to 3,897.96, 5,379.21 and 2,129.61

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Solution

The fourth proportional to 3,897.96, 5,379.21 and 2,129.61 is: 2,938.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.96 : 5,379.21 = 2,129.61 : x
  2. Step 2: Convert to fraction form
    3,897.96/5,379.21 = 2,129.61/x
  3. Step 3: Cross multiply
    3,897.96x = 5,379.21 × 2,129.61
  4. Step 4: Simplify right side
    3,897.96x = 11,455,619.41
  5. Step 5: Solve for x
    x = 11,455,619.41/3,897.96
  6. Step 6: Final answer
    x = 2,938.88

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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.