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Finding the Fourth Proportional to 5,286.69, 7,929.60 and 1,390.98

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Solution

The fourth proportional to 5,286.69, 7,929.60 and 1,390.98 is: 2,086.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,286.69 : 7,929.60 = 1,390.98 : x
  2. Step 2: Convert to fraction form
    5,286.69/7,929.60 = 1,390.98/x
  3. Step 3: Cross multiply
    5,286.69x = 7,929.60 × 1,390.98
  4. Step 4: Simplify right side
    5,286.69x = 11,029,915.01
  5. Step 5: Solve for x
    x = 11,029,915.01/5,286.69
  6. Step 6: Final answer
    x = 2,086.36

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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.