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Finding the Fourth Proportional to 18,711.81, 28,067.64 and 4,860.81

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Solution

The fourth proportional to 18,711.81, 28,067.64 and 4,860.81 is: 7,291.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,711.81 : 28,067.64 = 4,860.81 : x
  2. Step 2: Convert to fraction form
    18,711.81/28,067.64 = 4,860.81/x
  3. Step 3: Cross multiply
    18,711.81x = 28,067.64 × 4,860.81
  4. Step 4: Simplify right side
    18,711.81x = 136,431,465.19
  5. Step 5: Solve for x
    x = 136,431,465.19/18,711.81
  6. Step 6: Final answer
    x = 7,291.20

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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.