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Finding the Fourth Proportional to 7,221.62, 9,965.94 and 4,077.20

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Solution

The fourth proportional to 7,221.62, 9,965.94 and 4,077.20 is: 5,626.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,221.62 : 9,965.94 = 4,077.20 : x
  2. Step 2: Convert to fraction form
    7,221.62/9,965.94 = 4,077.20/x
  3. Step 3: Cross multiply
    7,221.62x = 9,965.94 × 4,077.20
  4. Step 4: Simplify right side
    7,221.62x = 40,633,130.57
  5. Step 5: Solve for x
    x = 40,633,130.57/7,221.62
  6. Step 6: Final answer
    x = 5,626.59

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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.