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Finding the Fourth Proportional to 18,912.66, 28,355.85 and 8,376.94

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Solution

The fourth proportional to 18,912.66, 28,355.85 and 8,376.94 is: 12,559.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,912.66 : 28,355.85 = 8,376.94 : x
  2. Step 2: Convert to fraction form
    18,912.66/28,355.85 = 8,376.94/x
  3. Step 3: Cross multiply
    18,912.66x = 28,355.85 × 8,376.94
  4. Step 4: Simplify right side
    18,912.66x = 237,535,254.10
  5. Step 5: Solve for x
    x = 237,535,254.10/18,912.66
  6. Step 6: Final answer
    x = 12,559.59

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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.