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Finding the Fourth Proportional to 10,919.79, 16,379.69 and 8,718.21

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Solution

The fourth proportional to 10,919.79, 16,379.69 and 8,718.21 is: 13,077.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,919.79 : 16,379.69 = 8,718.21 : x
  2. Step 2: Convert to fraction form
    10,919.79/16,379.69 = 8,718.21/x
  3. Step 3: Cross multiply
    10,919.79x = 16,379.69 × 8,718.21
  4. Step 4: Simplify right side
    10,919.79x = 142,801,533.56
  5. Step 5: Solve for x
    x = 142,801,533.56/10,919.79
  6. Step 6: Final answer
    x = 13,077.32

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.