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Finding the Fourth Proportional to 7,296, 10,938 and 2,909.20

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Solution

The fourth proportional to 7,296, 10,938 and 2,909.20 is: 4,361.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,296 : 10,938 = 2,909.20 : x
  2. Step 2: Convert to fraction form
    7,296/10,938 = 2,909.20/x
  3. Step 3: Cross multiply
    7,296x = 10,938 × 2,909.20
  4. Step 4: Simplify right side
    7,296x = 31,820,829.60
  5. Step 5: Solve for x
    x = 31,820,829.60/7,296
  6. Step 6: Final answer
    x = 4,361.41

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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.