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Finding the Fourth Proportional to 7,145.91, 10,719.90 and 2,215.89

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Solution

The fourth proportional to 7,145.91, 10,719.90 and 2,215.89 is: 3,324.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,145.91 : 10,719.90 = 2,215.89 : x
  2. Step 2: Convert to fraction form
    7,145.91/10,719.90 = 2,215.89/x
  3. Step 3: Cross multiply
    7,145.91x = 10,719.90 × 2,215.89
  4. Step 4: Simplify right side
    7,145.91x = 23,754,119.21
  5. Step 5: Solve for x
    x = 23,754,119.21/7,145.91
  6. Step 6: Final answer
    x = 3,324.16

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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.