Home / 5,286.78-7,930.26-1,390.88

Finding the Fourth Proportional to 5,286.78, 7,930.26 and 1,390.88

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Solution

The fourth proportional to 5,286.78, 7,930.26 and 1,390.88 is: 2,086.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,286.78 : 7,930.26 = 1,390.88 : x
  2. Step 2: Convert to fraction form
    5,286.78/7,930.26 = 1,390.88/x
  3. Step 3: Cross multiply
    5,286.78x = 7,930.26 × 1,390.88
  4. Step 4: Simplify right side
    5,286.78x = 11,030,000.38
  5. Step 5: Solve for x
    x = 11,030,000.38/5,286.78
  6. Step 6: Final answer
    x = 2,086.34

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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.