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Finding the Fourth Proportional to 7,905.80, 11,847.90 and 5,265.80

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Solution

The fourth proportional to 7,905.80, 11,847.90 and 5,265.80 is: 7,891.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,905.80 : 11,847.90 = 5,265.80 : x
  2. Step 2: Convert to fraction form
    7,905.80/11,847.90 = 5,265.80/x
  3. Step 3: Cross multiply
    7,905.80x = 11,847.90 × 5,265.80
  4. Step 4: Simplify right side
    7,905.80x = 62,388,671.82
  5. Step 5: Solve for x
    x = 62,388,671.82/7,905.80
  6. Step 6: Final answer
    x = 7,891.51

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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.