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Finding the Fourth Proportional to 7,211.28, 9,951.54 and 3,899.28

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Solution

The fourth proportional to 7,211.28, 9,951.54 and 3,899.28 is: 5,380.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,211.28 : 9,951.54 = 3,899.28 : x
  2. Step 2: Convert to fraction form
    7,211.28/9,951.54 = 3,899.28/x
  3. Step 3: Cross multiply
    7,211.28x = 9,951.54 × 3,899.28
  4. Step 4: Simplify right side
    7,211.28x = 38,803,840.89
  5. Step 5: Solve for x
    x = 38,803,840.89/7,211.28
  6. Step 6: Final answer
    x = 5,380.99

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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.