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Finding the Fourth Proportional to 18,912.42, 28,358.91 and 8,518.50

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Solution

The fourth proportional to 18,912.42, 28,358.91 and 8,518.50 is: 12,773.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,912.42 : 28,358.91 = 8,518.50 : x
  2. Step 2: Convert to fraction form
    18,912.42/28,358.91 = 8,518.50/x
  3. Step 3: Cross multiply
    18,912.42x = 28,358.91 × 8,518.50
  4. Step 4: Simplify right side
    18,912.42x = 241,575,374.84
  5. Step 5: Solve for x
    x = 241,575,374.84/18,912.42
  6. Step 6: Final answer
    x = 12,773.37

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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.