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Finding the Fourth Proportional to 8,765.39, 13,147.81 and 2,921.85

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Solution

The fourth proportional to 8,765.39, 13,147.81 and 2,921.85 is: 4,382.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,765.39 : 13,147.81 = 2,921.85 : x
  2. Step 2: Convert to fraction form
    8,765.39/13,147.81 = 2,921.85/x
  3. Step 3: Cross multiply
    8,765.39x = 13,147.81 × 2,921.85
  4. Step 4: Simplify right side
    8,765.39x = 38,415,928.65
  5. Step 5: Solve for x
    x = 38,415,928.65/8,765.39
  6. Step 6: Final answer
    x = 4,382.68

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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.