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Finding the Fourth Proportional to 18,874.86, 28,289.61 and 13,319.88

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Solution

The fourth proportional to 18,874.86, 28,289.61 and 13,319.88 is: 19,963.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,874.86 : 28,289.61 = 13,319.88 : x
  2. Step 2: Convert to fraction form
    18,874.86/28,289.61 = 13,319.88/x
  3. Step 3: Cross multiply
    18,874.86x = 28,289.61 × 13,319.88
  4. Step 4: Simplify right side
    18,874.86x = 376,814,210.45
  5. Step 5: Solve for x
    x = 376,814,210.45/18,874.86
  6. Step 6: Final answer
    x = 19,963.81

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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.