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Finding the Fourth Proportional to 10,979.80, 16,450.80 and 5,124.40

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Solution

The fourth proportional to 10,979.80, 16,450.80 and 5,124.40 is: 7,677.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,979.80 : 16,450.80 = 5,124.40 : x
  2. Step 2: Convert to fraction form
    10,979.80/16,450.80 = 5,124.40/x
  3. Step 3: Cross multiply
    10,979.80x = 16,450.80 × 5,124.40
  4. Step 4: Simplify right side
    10,979.80x = 84,300,479.52
  5. Step 5: Solve for x
    x = 84,300,479.52/10,979.80
  6. Step 6: Final answer
    x = 7,677.78

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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.