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Finding the Fourth Proportional to 7,768.66, 10,720.80 and 4,231.81

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Solution

The fourth proportional to 7,768.66, 10,720.80 and 4,231.81 is: 5,839.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,768.66 : 10,720.80 = 4,231.81 : x
  2. Step 2: Convert to fraction form
    7,768.66/10,720.80 = 4,231.81/x
  3. Step 3: Cross multiply
    7,768.66x = 10,720.80 × 4,231.81
  4. Step 4: Simplify right side
    7,768.66x = 45,368,388.65
  5. Step 5: Solve for x
    x = 45,368,388.65/7,768.66
  6. Step 6: Final answer
    x = 5,839.92

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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.