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Finding the Fourth Proportional to 7,978.15, 11,009.55 and 4,441.29

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Solution

The fourth proportional to 7,978.15, 11,009.55 and 4,441.29 is: 6,128.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,978.15 : 11,009.55 = 4,441.29 : x
  2. Step 2: Convert to fraction form
    7,978.15/11,009.55 = 4,441.29/x
  3. Step 3: Cross multiply
    7,978.15x = 11,009.55 × 4,441.29
  4. Step 4: Simplify right side
    7,978.15x = 48,896,604.32
  5. Step 5: Solve for x
    x = 48,896,604.32/7,978.15
  6. Step 6: Final answer
    x = 6,128.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.