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Finding the Fourth Proportional to 11,920.19, 16,449.95 and 6,615.09

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Solution

The fourth proportional to 11,920.19, 16,449.95 and 6,615.09 is: 9,128.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,920.19 : 16,449.95 = 6,615.09 : x
  2. Step 2: Convert to fraction form
    11,920.19/16,449.95 = 6,615.09/x
  3. Step 3: Cross multiply
    11,920.19x = 16,449.95 × 6,615.09
  4. Step 4: Simplify right side
    11,920.19x = 108,817,916.28
  5. Step 5: Solve for x
    x = 108,817,916.28/11,920.19
  6. Step 6: Final answer
    x = 9,128.88

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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.