Home / 5,121.10-7,679.12-1,657.90

Finding the Fourth Proportional to 5,121.10, 7,679.12 and 1,657.90

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Solution

The fourth proportional to 5,121.10, 7,679.12 and 1,657.90 is: 2,486.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,121.10 : 7,679.12 = 1,657.90 : x
  2. Step 2: Convert to fraction form
    5,121.10/7,679.12 = 1,657.90/x
  3. Step 3: Cross multiply
    5,121.10x = 7,679.12 × 1,657.90
  4. Step 4: Simplify right side
    5,121.10x = 12,731,213.05
  5. Step 5: Solve for x
    x = 12,731,213.05/5,121.10
  6. Step 6: Final answer
    x = 2,486.03

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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.