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Finding the Fourth Proportional to 11,905.31, 16,421.88 and 7,661.90

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Solution

The fourth proportional to 11,905.31, 16,421.88 and 7,661.90 is: 10,568.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,905.31 : 16,421.88 = 7,661.90 : x
  2. Step 2: Convert to fraction form
    11,905.31/16,421.88 = 7,661.90/x
  3. Step 3: Cross multiply
    11,905.31x = 16,421.88 × 7,661.90
  4. Step 4: Simplify right side
    11,905.31x = 125,822,720.26
  5. Step 5: Solve for x
    x = 125,822,720.26/11,905.31
  6. Step 6: Final answer
    x = 10,568.63

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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.