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Finding the Fourth Proportional to 14,091.84, 21,120.48 and 7,917.12

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Solution

The fourth proportional to 14,091.84, 21,120.48 and 7,917.12 is: 11,865.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,091.84 : 21,120.48 = 7,917.12 : x
  2. Step 2: Convert to fraction form
    14,091.84/21,120.48 = 7,917.12/x
  3. Step 3: Cross multiply
    14,091.84x = 21,120.48 × 7,917.12
  4. Step 4: Simplify right side
    14,091.84x = 167,213,374.62
  5. Step 5: Solve for x
    x = 167,213,374.62/14,091.84
  6. Step 6: Final answer
    x = 11,865.97

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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.