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Finding the Fourth Proportional to 12,486.87, 18,726.94 and 4,990.09

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Solution

The fourth proportional to 12,486.87, 18,726.94 and 4,990.09 is: 7,483.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,486.87 : 18,726.94 = 4,990.09 : x
  2. Step 2: Convert to fraction form
    12,486.87/18,726.94 = 4,990.09/x
  3. Step 3: Cross multiply
    12,486.87x = 18,726.94 × 4,990.09
  4. Step 4: Simplify right side
    12,486.87x = 93,449,116.02
  5. Step 5: Solve for x
    x = 93,449,116.02/12,486.87
  6. Step 6: Final answer
    x = 7,483.79

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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.