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Finding the Fourth Proportional to 8,791.05, 12,129.61 and 5,204.21

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Solution

The fourth proportional to 8,791.05, 12,129.61 and 5,204.21 is: 7,180.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,791.05 : 12,129.61 = 5,204.21 : x
  2. Step 2: Convert to fraction form
    8,791.05/12,129.61 = 5,204.21/x
  3. Step 3: Cross multiply
    8,791.05x = 12,129.61 × 5,204.21
  4. Step 4: Simplify right side
    8,791.05x = 63,124,977.01
  5. Step 5: Solve for x
    x = 63,124,977.01/8,791.05
  6. Step 6: Final answer
    x = 7,180.60

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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.