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Finding the Fourth Proportional to 7,978.32, 11,009.76 and 4,441.92

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Solution

The fourth proportional to 7,978.32, 11,009.76 and 4,441.92 is: 6,129.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,978.32 : 11,009.76 = 4,441.92 : x
  2. Step 2: Convert to fraction form
    7,978.32/11,009.76 = 4,441.92/x
  3. Step 3: Cross multiply
    7,978.32x = 11,009.76 × 4,441.92
  4. Step 4: Simplify right side
    7,978.32x = 48,904,473.14
  5. Step 5: Solve for x
    x = 48,904,473.14/7,978.32
  6. Step 6: Final answer
    x = 6,129.67

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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.