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Finding the Fourth Proportional to 7,200, 9,940.32 and 4,720.32

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Solution

The fourth proportional to 7,200, 9,940.32 and 4,720.32 is: 6,516.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,200 : 9,940.32 = 4,720.32 : x
  2. Step 2: Convert to fraction form
    7,200/9,940.32 = 4,720.32/x
  3. Step 3: Cross multiply
    7,200x = 9,940.32 × 4,720.32
  4. Step 4: Simplify right side
    7,200x = 46,921,491.30
  5. Step 5: Solve for x
    x = 46,921,491.30/7,200
  6. Step 6: Final answer
    x = 6,516.87

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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.