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Finding the Fourth Proportional to 18,858, 28,288.37 and 5,711.40

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Solution

The fourth proportional to 18,858, 28,288.37 and 5,711.40 is: 8,567.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,858 : 28,288.37 = 5,711.40 : x
  2. Step 2: Convert to fraction form
    18,858/28,288.37 = 5,711.40/x
  3. Step 3: Cross multiply
    18,858x = 28,288.37 × 5,711.40
  4. Step 4: Simplify right side
    18,858x = 161,566,167.86
  5. Step 5: Solve for x
    x = 161,566,167.86/18,858
  6. Step 6: Final answer
    x = 8,567.51

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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.