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Finding the Fourth Proportional to 7,221.06, 9,965.10 and 3,909.06

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Solution

The fourth proportional to 7,221.06, 9,965.10 and 3,909.06 is: 5,394.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,221.06 : 9,965.10 = 3,909.06 : x
  2. Step 2: Convert to fraction form
    7,221.06/9,965.10 = 3,909.06/x
  3. Step 3: Cross multiply
    7,221.06x = 9,965.10 × 3,909.06
  4. Step 4: Simplify right side
    7,221.06x = 38,954,173.81
  5. Step 5: Solve for x
    x = 38,954,173.81/7,221.06
  6. Step 6: Final answer
    x = 5,394.52

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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.