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Finding the Fourth Proportional to 7,221.81, 9,965.98 and 4,035.15

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Solution

The fourth proportional to 7,221.81, 9,965.98 and 4,035.15 is: 5,568.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,221.81 : 9,965.98 = 4,035.15 : x
  2. Step 2: Convert to fraction form
    7,221.81/9,965.98 = 4,035.15/x
  3. Step 3: Cross multiply
    7,221.81x = 9,965.98 × 4,035.15
  4. Step 4: Simplify right side
    7,221.81x = 40,214,224.20
  5. Step 5: Solve for x
    x = 40,214,224.20/7,221.81
  6. Step 6: Final answer
    x = 5,568.44

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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.