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Finding the Fourth Proportional to 7,148.40, 10,719.40 and 2,764.40

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Solution

The fourth proportional to 7,148.40, 10,719.40 and 2,764.40 is: 4,145.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,148.40 : 10,719.40 = 2,764.40 : x
  2. Step 2: Convert to fraction form
    7,148.40/10,719.40 = 2,764.40/x
  3. Step 3: Cross multiply
    7,148.40x = 10,719.40 × 2,764.40
  4. Step 4: Simplify right side
    7,148.40x = 29,632,709.36
  5. Step 5: Solve for x
    x = 29,632,709.36/7,148.40
  6. Step 6: Final answer
    x = 4,145.36

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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.