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Finding the Fourth Proportional to 7,757.90, 10,705.89 and 4,221.09

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Solution

The fourth proportional to 7,757.90, 10,705.89 and 4,221.09 is: 5,825.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,757.90 : 10,705.89 = 4,221.09 : x
  2. Step 2: Convert to fraction form
    7,757.90/10,705.89 = 4,221.09/x
  3. Step 3: Cross multiply
    7,757.90x = 10,705.89 × 4,221.09
  4. Step 4: Simplify right side
    7,757.90x = 45,190,551.98
  5. Step 5: Solve for x
    x = 45,190,551.98/7,757.90
  6. Step 6: Final answer
    x = 5,825.10

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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.