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Finding the Fourth Proportional to 18,758.54, 28,137.79 and 7,518.95

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Solution

The fourth proportional to 18,758.54, 28,137.79 and 7,518.95 is: 11,278.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,758.54 : 28,137.79 = 7,518.95 : x
  2. Step 2: Convert to fraction form
    18,758.54/28,137.79 = 7,518.95/x
  3. Step 3: Cross multiply
    18,758.54x = 28,137.79 × 7,518.95
  4. Step 4: Simplify right side
    18,758.54x = 211,566,687.67
  5. Step 5: Solve for x
    x = 211,566,687.67/18,758.54
  6. Step 6: Final answer
    x = 11,278.42

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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.