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Finding the Fourth Proportional to 10,379.30, 15,571.93 and 5,115.89

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Solution

The fourth proportional to 10,379.30, 15,571.93 and 5,115.89 is: 7,675.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,379.30 : 15,571.93 = 5,115.89 : x
  2. Step 2: Convert to fraction form
    10,379.30/15,571.93 = 5,115.89/x
  3. Step 3: Cross multiply
    10,379.30x = 15,571.93 × 5,115.89
  4. Step 4: Simplify right side
    10,379.30x = 79,664,190.32
  5. Step 5: Solve for x
    x = 79,664,190.32/10,379.30
  6. Step 6: Final answer
    x = 7,675.29

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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.