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Finding the Fourth Proportional to 7,141.70, 9,855.54 and 3,997.89

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Solution

The fourth proportional to 7,141.70, 9,855.54 and 3,997.89 is: 5,517.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,141.70 : 9,855.54 = 3,997.89 : x
  2. Step 2: Convert to fraction form
    7,141.70/9,855.54 = 3,997.89/x
  3. Step 3: Cross multiply
    7,141.70x = 9,855.54 × 3,997.89
  4. Step 4: Simplify right side
    7,141.70x = 39,401,364.81
  5. Step 5: Solve for x
    x = 39,401,364.81/7,141.70
  6. Step 6: Final answer
    x = 5,517.08

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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.