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Finding the Fourth Proportional to 18,907.16, 28,361.01 and 7,221.02

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Solution

The fourth proportional to 18,907.16, 28,361.01 and 7,221.02 is: 10,831.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,907.16 : 28,361.01 = 7,221.02 : x
  2. Step 2: Convert to fraction form
    18,907.16/28,361.01 = 7,221.02/x
  3. Step 3: Cross multiply
    18,907.16x = 28,361.01 × 7,221.02
  4. Step 4: Simplify right side
    18,907.16x = 204,795,420.43
  5. Step 5: Solve for x
    x = 204,795,420.43/18,907.16
  6. Step 6: Final answer
    x = 10,831.63

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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.