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Finding the Fourth Proportional to 7,220.90, 9,963.78 and 4,236.05

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Solution

The fourth proportional to 7,220.90, 9,963.78 and 4,236.05 is: 5,845.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,220.90 : 9,963.78 = 4,236.05 : x
  2. Step 2: Convert to fraction form
    7,220.90/9,963.78 = 4,236.05/x
  3. Step 3: Cross multiply
    7,220.90x = 9,963.78 × 4,236.05
  4. Step 4: Simplify right side
    7,220.90x = 42,207,020.45
  5. Step 5: Solve for x
    x = 42,207,020.45/7,220.90
  6. Step 6: Final answer
    x = 5,845.12

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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.