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Finding the Fourth Proportional to 18,674.90, 28,017.30 and 8,140.40

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Solution

The fourth proportional to 18,674.90, 28,017.30 and 8,140.40 is: 12,212.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,674.90 : 28,017.30 = 8,140.40 : x
  2. Step 2: Convert to fraction form
    18,674.90/28,017.30 = 8,140.40/x
  3. Step 3: Cross multiply
    18,674.90x = 28,017.30 × 8,140.40
  4. Step 4: Simplify right side
    18,674.90x = 228,072,028.92
  5. Step 5: Solve for x
    x = 228,072,028.92/18,674.90
  6. Step 6: Final answer
    x = 12,212.76

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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.