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Finding the Fourth Proportional to 11,920.96, 17,880.64 and 4,899.15

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Solution

The fourth proportional to 11,920.96, 17,880.64 and 4,899.15 is: 7,348.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,920.96 : 17,880.64 = 4,899.15 : x
  2. Step 2: Convert to fraction form
    11,920.96/17,880.64 = 4,899.15/x
  3. Step 3: Cross multiply
    11,920.96x = 17,880.64 × 4,899.15
  4. Step 4: Simplify right side
    11,920.96x = 87,600,010.63
  5. Step 5: Solve for x
    x = 87,600,010.63/11,920.96
  6. Step 6: Final answer
    x = 7,348.40

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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.