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Finding the Fourth Proportional to 6,505.79, 8,974.46 and 3,989.12

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Solution

The fourth proportional to 6,505.79, 8,974.46 and 3,989.12 is: 5,502.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,505.79 : 8,974.46 = 3,989.12 : x
  2. Step 2: Convert to fraction form
    6,505.79/8,974.46 = 3,989.12/x
  3. Step 3: Cross multiply
    6,505.79x = 8,974.46 × 3,989.12
  4. Step 4: Simplify right side
    6,505.79x = 35,800,162.98
  5. Step 5: Solve for x
    x = 35,800,162.98/6,505.79
  6. Step 6: Final answer
    x = 5,502.82

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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.