Home / 5,418.81-8,128.90-1,719.72

Finding the Fourth Proportional to 5,418.81, 8,128.90 and 1,719.72

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Solution

The fourth proportional to 5,418.81, 8,128.90 and 1,719.72 is: 2,579.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,418.81 : 8,128.90 = 1,719.72 : x
  2. Step 2: Convert to fraction form
    5,418.81/8,128.90 = 1,719.72/x
  3. Step 3: Cross multiply
    5,418.81x = 8,128.90 × 1,719.72
  4. Step 4: Simplify right side
    5,418.81x = 13,979,434.06
  5. Step 5: Solve for x
    x = 13,979,434.06/5,418.81
  6. Step 6: Final answer
    x = 2,579.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.