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Finding the Fourth Proportional to 10,563.80, 15,813.30 and 9,980.60

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Solution

The fourth proportional to 10,563.80, 15,813.30 and 9,980.60 is: 14,940.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,563.80 : 15,813.30 = 9,980.60 : x
  2. Step 2: Convert to fraction form
    10,563.80/15,813.30 = 9,980.60/x
  3. Step 3: Cross multiply
    10,563.80x = 15,813.30 × 9,980.60
  4. Step 4: Simplify right side
    10,563.80x = 157,826,221.98
  5. Step 5: Solve for x
    x = 157,826,221.98/10,563.80
  6. Step 6: Final answer
    x = 14,940.29

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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.