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Finding the Fourth Proportional to 18,958.63, 28,442 and 7,271.75

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Solution

The fourth proportional to 18,958.63, 28,442 and 7,271.75 is: 10,909.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,958.63 : 28,442 = 7,271.75 : x
  2. Step 2: Convert to fraction form
    18,958.63/28,442 = 7,271.75/x
  3. Step 3: Cross multiply
    18,958.63x = 28,442 × 7,271.75
  4. Step 4: Simplify right side
    18,958.63x = 206,823,113.50
  5. Step 5: Solve for x
    x = 206,823,113.50/18,958.63
  6. Step 6: Final answer
    x = 10,909.18

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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.