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Finding the Fourth Proportional to 18,986.60, 28,479.90 and 8,618.60

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Solution

The fourth proportional to 18,986.60, 28,479.90 and 8,618.60 is: 12,927.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,986.60 : 28,479.90 = 8,618.60 : x
  2. Step 2: Convert to fraction form
    18,986.60/28,479.90 = 8,618.60/x
  3. Step 3: Cross multiply
    18,986.60x = 28,479.90 × 8,618.60
  4. Step 4: Simplify right side
    18,986.60x = 245,456,866.14
  5. Step 5: Solve for x
    x = 245,456,866.14/18,986.60
  6. Step 6: Final answer
    x = 12,927.90

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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.