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Finding the Fourth Proportional to 11,905.40, 16,443.46 and 7,919.40

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Solution

The fourth proportional to 11,905.40, 16,443.46 and 7,919.40 is: 10,938.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,905.40 : 16,443.46 = 7,919.40 : x
  2. Step 2: Convert to fraction form
    11,905.40/16,443.46 = 7,919.40/x
  3. Step 3: Cross multiply
    11,905.40x = 16,443.46 × 7,919.40
  4. Step 4: Simplify right side
    11,905.40x = 130,222,337.12
  5. Step 5: Solve for x
    x = 130,222,337.12/11,905.40
  6. Step 6: Final answer
    x = 10,938.09

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Half scale
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Double scale
Find fourth proportional to 11,906.40, 16,444.84 and 7,920.40
Similar ratio
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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.