Home / 3,898.08-5,379.09-2,129.68

Finding the Fourth Proportional to 3,898.08, 5,379.09 and 2,129.68

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Solution

The fourth proportional to 3,898.08, 5,379.09 and 2,129.68 is: 2,938.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,898.08 : 5,379.09 = 2,129.68 : x
  2. Step 2: Convert to fraction form
    3,898.08/5,379.09 = 2,129.68/x
  3. Step 3: Cross multiply
    3,898.08x = 5,379.09 × 2,129.68
  4. Step 4: Simplify right side
    3,898.08x = 11,455,740.39
  5. Step 5: Solve for x
    x = 11,455,740.39/3,898.08
  6. Step 6: Final answer
    x = 2,938.82

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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.