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Finding the Fourth Proportional to 18,874.41, 28,311.89 and 7,188.27

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Solution

The fourth proportional to 18,874.41, 28,311.89 and 7,188.27 is: 10,782.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,874.41 : 28,311.89 = 7,188.27 : x
  2. Step 2: Convert to fraction form
    18,874.41/28,311.89 = 7,188.27/x
  3. Step 3: Cross multiply
    18,874.41x = 28,311.89 × 7,188.27
  4. Step 4: Simplify right side
    18,874.41x = 203,513,509.53
  5. Step 5: Solve for x
    x = 203,513,509.53/18,874.41
  6. Step 6: Final answer
    x = 10,782.51

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1.5x scale

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.