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Finding the Fourth Proportional to 12,335.28, 18,489.96 and 8,438.64

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Solution

The fourth proportional to 12,335.28, 18,489.96 and 8,438.64 is: 12,649.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,335.28 : 18,489.96 = 8,438.64 : x
  2. Step 2: Convert to fraction form
    12,335.28/18,489.96 = 8,438.64/x
  3. Step 3: Cross multiply
    12,335.28x = 18,489.96 × 8,438.64
  4. Step 4: Simplify right side
    12,335.28x = 156,030,116.05
  5. Step 5: Solve for x
    x = 156,030,116.05/12,335.28
  6. Step 6: Final answer
    x = 12,649.09

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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.