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Finding the Fourth Proportional to 18,705.46, 28,045.23 and 8,311.54

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Solution

The fourth proportional to 18,705.46, 28,045.23 and 8,311.54 is: 12,461.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,705.46 : 28,045.23 = 8,311.54 : x
  2. Step 2: Convert to fraction form
    18,705.46/28,045.23 = 8,311.54/x
  3. Step 3: Cross multiply
    18,705.46x = 28,045.23 × 8,311.54
  4. Step 4: Simplify right side
    18,705.46x = 233,099,050.95
  5. Step 5: Solve for x
    x = 233,099,050.95/18,705.46
  6. Step 6: Final answer
    x = 12,461.55

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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.