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Finding the Fourth Proportional to 10,720.80, 16,076.40 and 4,874.40

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Solution

The fourth proportional to 10,720.80, 16,076.40 and 4,874.40 is: 7,309.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,720.80 : 16,076.40 = 4,874.40 : x
  2. Step 2: Convert to fraction form
    10,720.80/16,076.40 = 4,874.40/x
  3. Step 3: Cross multiply
    10,720.80x = 16,076.40 × 4,874.40
  4. Step 4: Simplify right side
    10,720.80x = 78,362,804.16
  5. Step 5: Solve for x
    x = 78,362,804.16/10,720.80
  6. Step 6: Final answer
    x = 7,309.42

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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.