Home / 3,898.02-5,379.21-2,129.59

Finding the Fourth Proportional to 3,898.02, 5,379.21 and 2,129.59

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Solution

The fourth proportional to 3,898.02, 5,379.21 and 2,129.59 is: 2,938.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,898.02 : 5,379.21 = 2,129.59 : x
  2. Step 2: Convert to fraction form
    3,898.02/5,379.21 = 2,129.59/x
  3. Step 3: Cross multiply
    3,898.02x = 5,379.21 × 2,129.59
  4. Step 4: Simplify right side
    3,898.02x = 11,455,518.55
  5. Step 5: Solve for x
    x = 11,455,518.55/3,898.02
  6. Step 6: Final answer
    x = 2,938.80

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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.