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Finding the Fourth Proportional to 7,176.86, 9,903.02 and 3,989.90

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Solution

The fourth proportional to 7,176.86, 9,903.02 and 3,989.90 is: 5,505.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,176.86 : 9,903.02 = 3,989.90 : x
  2. Step 2: Convert to fraction form
    7,176.86/9,903.02 = 3,989.90/x
  3. Step 3: Cross multiply
    7,176.86x = 9,903.02 × 3,989.90
  4. Step 4: Simplify right side
    7,176.86x = 39,512,059.50
  5. Step 5: Solve for x
    x = 39,512,059.50/7,176.86
  6. Step 6: Final answer
    x = 5,505.48

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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.