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Finding the Fourth Proportional to 7,978.20, 11,009.52 and 4,441.44

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Solution

The fourth proportional to 7,978.20, 11,009.52 and 4,441.44 is: 6,128.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,978.20 : 11,009.52 = 4,441.44 : x
  2. Step 2: Convert to fraction form
    7,978.20/11,009.52 = 4,441.44/x
  3. Step 3: Cross multiply
    7,978.20x = 11,009.52 × 4,441.44
  4. Step 4: Simplify right side
    7,978.20x = 48,898,122.51
  5. Step 5: Solve for x
    x = 48,898,122.51/7,978.20
  6. Step 6: Final answer
    x = 6,128.97

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1.5x scale

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.