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Finding the Fourth Proportional to 7,217.69, 9,960.44 and 3,905.69

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Solution

The fourth proportional to 7,217.69, 9,960.44 and 3,905.69 is: 5,389.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,217.69 : 9,960.44 = 3,905.69 : x
  2. Step 2: Convert to fraction form
    7,217.69/9,960.44 = 3,905.69/x
  3. Step 3: Cross multiply
    7,217.69x = 9,960.44 × 3,905.69
  4. Step 4: Simplify right side
    7,217.69x = 38,902,390.90
  5. Step 5: Solve for x
    x = 38,902,390.90/7,217.69
  6. Step 6: Final answer
    x = 5,389.87

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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.