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Finding the Fourth Proportional to 7,211.16, 9,951.32 and 3,899.16

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Solution

The fourth proportional to 7,211.16, 9,951.32 and 3,899.16 is: 5,380.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,211.16 : 9,951.32 = 3,899.16 : x
  2. Step 2: Convert to fraction form
    7,211.16/9,951.32 = 3,899.16/x
  3. Step 3: Cross multiply
    7,211.16x = 9,951.32 × 3,899.16
  4. Step 4: Simplify right side
    7,211.16x = 38,801,788.89
  5. Step 5: Solve for x
    x = 38,801,788.89/7,211.16
  6. Step 6: Final answer
    x = 5,380.80

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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.