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Finding the Fourth Proportional to 11,920.80, 16,450.90 and 6,615.64

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Solution

The fourth proportional to 11,920.80, 16,450.90 and 6,615.64 is: 9,129.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,920.80 : 16,450.90 = 6,615.64 : x
  2. Step 2: Convert to fraction form
    11,920.80/16,450.90 = 6,615.64/x
  3. Step 3: Cross multiply
    11,920.80x = 16,450.90 × 6,615.64
  4. Step 4: Simplify right side
    11,920.80x = 108,833,236.10
  5. Step 5: Solve for x
    x = 108,833,236.10/11,920.80
  6. Step 6: Final answer
    x = 9,129.69

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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.