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Finding the Fourth Proportional to 18,874.80, 28,312.18 and 8,474.40

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Solution

The fourth proportional to 18,874.80, 28,312.18 and 8,474.40 is: 12,711.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,874.80 : 28,312.18 = 8,474.40 : x
  2. Step 2: Convert to fraction form
    18,874.80/28,312.18 = 8,474.40/x
  3. Step 3: Cross multiply
    18,874.80x = 28,312.18 × 8,474.40
  4. Step 4: Simplify right side
    18,874.80x = 239,928,738.19
  5. Step 5: Solve for x
    x = 239,928,738.19/18,874.80
  6. Step 6: Final answer
    x = 12,711.59

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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.