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Finding the Fourth Proportional to 7,145.60, 10,719.20 and 2,215.20

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Solution

The fourth proportional to 7,145.60, 10,719.20 and 2,215.20 is: 3,323.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,145.60 : 10,719.20 = 2,215.20 : x
  2. Step 2: Convert to fraction form
    7,145.60/10,719.20 = 2,215.20/x
  3. Step 3: Cross multiply
    7,145.60x = 10,719.20 × 2,215.20
  4. Step 4: Simplify right side
    7,145.60x = 23,745,171.84
  5. Step 5: Solve for x
    x = 23,745,171.84/7,145.60
  6. Step 6: Final answer
    x = 3,323.05

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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.