Home / 5,105.12-7,658.18-1,986.64

Finding the Fourth Proportional to 5,105.12, 7,658.18 and 1,986.64

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Solution

The fourth proportional to 5,105.12, 7,658.18 and 1,986.64 is: 2,980.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,105.12 : 7,658.18 = 1,986.64 : x
  2. Step 2: Convert to fraction form
    5,105.12/7,658.18 = 1,986.64/x
  3. Step 3: Cross multiply
    5,105.12x = 7,658.18 × 1,986.64
  4. Step 4: Simplify right side
    5,105.12x = 15,214,046.72
  5. Step 5: Solve for x
    x = 15,214,046.72/5,105.12
  6. Step 6: Final answer
    x = 2,980.15

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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.