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Finding the Fourth Proportional to 8,765.13, 13,147.77 and 2,921.74

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Solution

The fourth proportional to 8,765.13, 13,147.77 and 2,921.74 is: 4,382.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,765.13 : 13,147.77 = 2,921.74 : x
  2. Step 2: Convert to fraction form
    8,765.13/13,147.77 = 2,921.74/x
  3. Step 3: Cross multiply
    8,765.13x = 13,147.77 × 2,921.74
  4. Step 4: Simplify right side
    8,765.13x = 38,414,365.52
  5. Step 5: Solve for x
    x = 38,414,365.52/8,765.13
  6. Step 6: Final answer
    x = 4,382.64

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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.