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Finding the Fourth Proportional to 18,679.99, 28,019.99 and 12,818.83

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Solution

The fourth proportional to 18,679.99, 28,019.99 and 12,818.83 is: 19,228.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,679.99 : 28,019.99 = 12,818.83 : x
  2. Step 2: Convert to fraction form
    18,679.99/28,019.99 = 12,818.83/x
  3. Step 3: Cross multiply
    18,679.99x = 28,019.99 × 12,818.83
  4. Step 4: Simplify right side
    18,679.99x = 359,183,488.41
  5. Step 5: Solve for x
    x = 359,183,488.41/18,679.99
  6. Step 6: Final answer
    x = 19,228.25

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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.