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Finding the Fourth Proportional to 7,768.20, 10,719.90 and 4,231.20

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Solution

The fourth proportional to 7,768.20, 10,719.90 and 4,231.20 is: 5,838.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,768.20 : 10,719.90 = 4,231.20 : x
  2. Step 2: Convert to fraction form
    7,768.20/10,719.90 = 4,231.20/x
  3. Step 3: Cross multiply
    7,768.20x = 10,719.90 × 4,231.20
  4. Step 4: Simplify right side
    7,768.20x = 45,358,040.88
  5. Step 5: Solve for x
    x = 45,358,040.88/7,768.20
  6. Step 6: Final answer
    x = 5,838.94

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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.