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Finding the Fourth Proportional to 18,909.99, 28,361.75 and 5,055.75

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Solution

The fourth proportional to 18,909.99, 28,361.75 and 5,055.75 is: 7,582.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,909.99 : 28,361.75 = 5,055.75 : x
  2. Step 2: Convert to fraction form
    18,909.99/28,361.75 = 5,055.75/x
  3. Step 3: Cross multiply
    18,909.99x = 28,361.75 × 5,055.75
  4. Step 4: Simplify right side
    18,909.99x = 143,389,892.28
  5. Step 5: Solve for x
    x = 143,389,892.28/18,909.99
  6. Step 6: Final answer
    x = 7,582.76

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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.