Home / 5,431.12-8,139.30-2,828.68

Finding the Fourth Proportional to 5,431.12, 8,139.30 and 2,828.68

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Solution

The fourth proportional to 5,431.12, 8,139.30 and 2,828.68 is: 4,239.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,431.12 : 8,139.30 = 2,828.68 : x
  2. Step 2: Convert to fraction form
    5,431.12/8,139.30 = 2,828.68/x
  3. Step 3: Cross multiply
    5,431.12x = 8,139.30 × 2,828.68
  4. Step 4: Simplify right side
    5,431.12x = 23,023,475.12
  5. Step 5: Solve for x
    x = 23,023,475.12/5,431.12
  6. Step 6: Final answer
    x = 4,239.18

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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.