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Finding the Fourth Proportional to 7,320.64, 10,991.90 and 7,211.29

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Solution

The fourth proportional to 7,320.64, 10,991.90 and 7,211.29 is: 10,827.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,320.64 : 10,991.90 = 7,211.29 : x
  2. Step 2: Convert to fraction form
    7,320.64/10,991.90 = 7,211.29/x
  3. Step 3: Cross multiply
    7,320.64x = 10,991.90 × 7,211.29
  4. Step 4: Simplify right side
    7,320.64x = 79,265,778.55
  5. Step 5: Solve for x
    x = 79,265,778.55/7,320.64
  6. Step 6: Final answer
    x = 10,827.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.