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Finding the Fourth Proportional to 7,879.51, 11,820.88 and 5,415.49

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Solution

The fourth proportional to 7,879.51, 11,820.88 and 5,415.49 is: 8,124.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,879.51 : 11,820.88 = 5,415.49 : x
  2. Step 2: Convert to fraction form
    7,879.51/11,820.88 = 5,415.49/x
  3. Step 3: Cross multiply
    7,879.51x = 11,820.88 × 5,415.49
  4. Step 4: Simplify right side
    7,879.51x = 64,015,857.43
  5. Step 5: Solve for x
    x = 64,015,857.43/7,879.51
  6. Step 6: Final answer
    x = 8,124.34

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1.5x scale

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.