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Finding the Fourth Proportional to 7,318.58, 10,979.92 and 2,939.11

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Solution

The fourth proportional to 7,318.58, 10,979.92 and 2,939.11 is: 4,409.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,318.58 : 10,979.92 = 2,939.11 : x
  2. Step 2: Convert to fraction form
    7,318.58/10,979.92 = 2,939.11/x
  3. Step 3: Cross multiply
    7,318.58x = 10,979.92 × 2,939.11
  4. Step 4: Simplify right side
    7,318.58x = 32,271,123.08
  5. Step 5: Solve for x
    x = 32,271,123.08/7,318.58
  6. Step 6: Final answer
    x = 4,409.48

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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.