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Finding the Fourth Proportional to 7,221.39, 9,965.57 and 4,155.71

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Solution

The fourth proportional to 7,221.39, 9,965.57 and 4,155.71 is: 5,734.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,221.39 : 9,965.57 = 4,155.71 : x
  2. Step 2: Convert to fraction form
    7,221.39/9,965.57 = 4,155.71/x
  3. Step 3: Cross multiply
    7,221.39x = 9,965.57 × 4,155.71
  4. Step 4: Simplify right side
    7,221.39x = 41,413,948.30
  5. Step 5: Solve for x
    x = 41,413,948.30/7,221.39
  6. Step 6: Final answer
    x = 5,734.90

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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.