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Finding the Fourth Proportional to 11,685.90, 16,128.62 and 6,905.66

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Solution

The fourth proportional to 11,685.90, 16,128.62 and 6,905.66 is: 9,531.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,685.90 : 16,128.62 = 6,905.66 : x
  2. Step 2: Convert to fraction form
    11,685.90/16,128.62 = 6,905.66/x
  3. Step 3: Cross multiply
    11,685.90x = 16,128.62 × 6,905.66
  4. Step 4: Simplify right side
    11,685.90x = 111,378,676.71
  5. Step 5: Solve for x
    x = 111,378,676.71/11,685.90
  6. Step 6: Final answer
    x = 9,531.03

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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.