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Finding the Fourth Proportional to 7,217.50, 9,960.16 and 3,905.50

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Solution

The fourth proportional to 7,217.50, 9,960.16 and 3,905.50 is: 5,389.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,217.50 : 9,960.16 = 3,905.50 : x
  2. Step 2: Convert to fraction form
    7,217.50/9,960.16 = 3,905.50/x
  3. Step 3: Cross multiply
    7,217.50x = 9,960.16 × 3,905.50
  4. Step 4: Simplify right side
    7,217.50x = 38,899,404.88
  5. Step 5: Solve for x
    x = 38,899,404.88/7,217.50
  6. Step 6: Final answer
    x = 5,389.60

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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.