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Finding the Fourth Proportional to 8,765.81, 13,129.10 and 4,078.79

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Solution

The fourth proportional to 8,765.81, 13,129.10 and 4,078.79 is: 6,109.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,765.81 : 13,129.10 = 4,078.79 : x
  2. Step 2: Convert to fraction form
    8,765.81/13,129.10 = 4,078.79/x
  3. Step 3: Cross multiply
    8,765.81x = 13,129.10 × 4,078.79
  4. Step 4: Simplify right side
    8,765.81x = 53,550,821.40
  5. Step 5: Solve for x
    x = 53,550,821.40/8,765.81
  6. Step 6: Final answer
    x = 6,109.06

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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.