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Finding the Fourth Proportional to 18,867.86, 28,300.16 and 6,387.62

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Solution

The fourth proportional to 18,867.86, 28,300.16 and 6,387.62 is: 9,580.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,867.86 : 28,300.16 = 6,387.62 : x
  2. Step 2: Convert to fraction form
    18,867.86/28,300.16 = 6,387.62/x
  3. Step 3: Cross multiply
    18,867.86x = 28,300.16 × 6,387.62
  4. Step 4: Simplify right side
    18,867.86x = 180,770,494.58
  5. Step 5: Solve for x
    x = 180,770,494.58/18,867.86
  6. Step 6: Final answer
    x = 9,580.87

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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.