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Finding the Fourth Proportional to 18,718.80, 28,078.14 and 12,857.64

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Solution

The fourth proportional to 18,718.80, 28,078.14 and 12,857.64 is: 19,286.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,718.80 : 28,078.14 = 12,857.64 : x
  2. Step 2: Convert to fraction form
    18,718.80/28,078.14 = 12,857.64/x
  3. Step 3: Cross multiply
    18,718.80x = 28,078.14 × 12,857.64
  4. Step 4: Simplify right side
    18,718.80x = 361,018,615.99
  5. Step 5: Solve for x
    x = 361,018,615.99/18,718.80
  6. Step 6: Final answer
    x = 19,286.42

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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.