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Finding the Fourth Proportional to 7,221.63, 9,965.85 and 4,078.02

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Solution

The fourth proportional to 7,221.63, 9,965.85 and 4,078.02 is: 5,627.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,221.63 : 9,965.85 = 4,078.02 : x
  2. Step 2: Convert to fraction form
    7,221.63/9,965.85 = 4,078.02/x
  3. Step 3: Cross multiply
    7,221.63x = 9,965.85 × 4,078.02
  4. Step 4: Simplify right side
    7,221.63x = 40,640,935.62
  5. Step 5: Solve for x
    x = 40,640,935.62/7,221.63
  6. Step 6: Final answer
    x = 5,627.67

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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.