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Finding the Fourth Proportional to 7,620.20, 11,398.68 and 7,153.64

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Solution

The fourth proportional to 7,620.20, 11,398.68 and 7,153.64 is: 10,700.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,620.20 : 11,398.68 = 7,153.64 : x
  2. Step 2: Convert to fraction form
    7,620.20/11,398.68 = 7,153.64/x
  3. Step 3: Cross multiply
    7,620.20x = 11,398.68 × 7,153.64
  4. Step 4: Simplify right side
    7,620.20x = 81,542,053.20
  5. Step 5: Solve for x
    x = 81,542,053.20/7,620.20
  6. Step 6: Final answer
    x = 10,700.78

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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.