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Finding the Fourth Proportional to 18,847.71, 28,276.25 and 13,311.86

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Solution

The fourth proportional to 18,847.71, 28,276.25 and 13,311.86 is: 19,971.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,847.71 : 28,276.25 = 13,311.86 : x
  2. Step 2: Convert to fraction form
    18,847.71/28,276.25 = 13,311.86/x
  3. Step 3: Cross multiply
    18,847.71x = 28,276.25 × 13,311.86
  4. Step 4: Simplify right side
    18,847.71x = 376,409,273.38
  5. Step 5: Solve for x
    x = 376,409,273.38/18,847.71
  6. Step 6: Final answer
    x = 19,971.09

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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.